Blood Relationship and Coded Relationship CLAT Notes | EduRev

Logical Reasoning for CLAT

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LR : Blood Relationship and Coded Relationship CLAT Notes | EduRev

The document Blood Relationship and Coded Relationship CLAT Notes | EduRev is a part of the LR Course Logical Reasoning for CLAT.
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BLOOD RELATIONSHIP AND CODED RELATIONSHIP
Questions in Blood Relations are inevitably asked in examination. The questions are related to our ‘relationships’ in the family. The examiner wants to test your ability to see through the cobweb. It is a test of intelligence and logic. The student is expected to find out ‘relationship’ between two person based on the given ‘input’.

Before we proceed further, let us understand clearly that all relationships are extension of three basic relationships.
1. First Basic Relationship is of Parent & Child
2. Second Basic Relationship is of Husband & Wife
3. Third Basic Relationship of
Brother -----------Brother
or   Brother-----------Sister
or   Sister----------Sister
4. The gender of the persons whose relationship is to be found is also of utmost importance.
To solve the questions based on Blood relationships, we can represent them diagrammatically as follows

Diagrammatic Representation
 Blood Relationship and Coded Relationship CLAT Notes | EduRevBlood Relationship and Coded Relationship CLAT Notes | EduRev
Blood Relationship and Coded Relationship CLAT Notes | EduRev
Blood Relationship and Coded Relationship CLAT Notes | EduRev
Blood Relationship and Coded Relationship CLAT Notes | EduRev 
This is expressed by one horizontal broken line with gender below it
Blood Relationship and Coded Relationship CLAT Notes | EduRev
We follow this as a standardized system so that there is no room for confusion. Based on above information, we can describe any relationship diagrammatically.
Generally two types of questions are asked in the examinations:
Type 1: Jumbled Relationships: These are based on direct relationships and the student is expected to see through and find out the exact relationship between the two persons.
Example 1: ‘My father’s only son’;
Solution: It means either the person himself or if the lady is talking to somebody, then she is talking about her brother.
Example 2: When the examiner says, “My son’s mother”,
Solution: It means the person is talking about his wife.
Example 3:  A person state that I have no brother or sister and the person in this photograph is son of my father.
Solution:  
Blood Relationship and Coded Relationship CLAT Notes | EduRev
So person is talking about himself & photograph is of his ‘own’.
Example 4: Pointing to a photograph, a person says that this is photograph of only daughter in law of his son’s mother. Whom is he talking about?
Solution: If we follow the statement and draw the diagram as follow:-

Blood Relationship and Coded Relationship CLAT Notes | EduRev
(Person’s son’s mother is Person’s wife)
Mother’s only ‘Daughter in law’ means that she has only one son and ‘Daughter in law’ is wife of his own son. The person is talking about. So she is ‘Daughter in law’ of the person as well.
Example 5: Pointing to a photograph, a man says, that this is photograph of paternal grandfather of husband of his daughter in law. Whom is he talking about?
SolutionRead the question carefully and draw the diagram following the leads given above:
Grandfather of (+)
Blood Relationship and Coded Relationship CLAT Notes | EduRev
(i)  Man’s daughter in law is his Son’s wife.
(ii)  Her husband is the son of that man (speaker)
(iii) Son’s grandfather is speaker’s father
(iv) Photograph is that of ‘father’ of man.
Example 6: A lady states that this is photograph of only daughter of ‘father- in – law’ of her husband. Whom she is talking about?
Solution: If we draw the diagram using above information, it follows as under:
(i) We identify lady.
(ii) We identify her husband.
(iii) We identify her husband’s father in law.
(iv) We identify that the daughter of husband’s father in law is the lady herself.

Blood Relationship and Coded Relationship CLAT Notes | EduRev
Since father in law has only one daughter, the lady is wife of the husband she is talking about. It means that it is her own photograph.
Based on information given to us, it is possible to solve questions based on Blood Relationships easily in two ways:-
1. Pictorial ways
2. Analytical Method
The student should start with Pictorial method and after they have clearly understood the pattern, should follow Analytical method to solve the question quickly or easily. the following chart will help you to solve questions in blood relationship

Mother’s  or  father’s son

Brother

Mother’s or father’ daughter

Sister

Mother’s or father’s sister / brother

Aunt / Uncle

Mother’s or father’s father

Grandfather

Mother’s or father’s mother

Grandmother

Son’s wife

Daughter in law

Daughter’s husband

Son-in-law

Husband’s or wife’s brother

Brother-in-law

Husband’s or wife’s sister

Sister-in-law

Brother’s son

Nephew

Brother’s daughter

Niece

Uncle or aunt’s son or daughter

Cousin

Sister’s husband

Brother-in-law

Brother’s wife

Sister-in-law

Grandson’s or Grand daughter’s daughter

Great grand daughter


Some Important Tips
(i) First of all choose the two persons, between whom relationship is to be established.
(ii) Next, pin-point the intermediate relationship i.e., such relationship through which long drawn relationship can be established between the required persons.
(iii) Finally, conclude the relationship directly between the two persons as per the requirement of the question.
Type 2: Coded Relationship: The relationship between the two persons is given in the form of a ‘symbol’. It may be given that A + B means that A is father of B.
It tells us that the symbol ‘+’ denotes the relation of ‘father’. But in this statement, it is given that it is A who is father of B and not vice versa. It does not mean that B is father of A and nor does it mean that B is son of A; for we do not know the gender of B. B may be either the son or daughter of A. Similarly, it may be given to us that A + B means that B is father of A.
Again the symbol ‘+’ stands for ‘father’. But here, it is B, who is father of A and not vice versa.
Thus the ‘Coded Relationship’ questions can be categorized into two types:
(i) Relation of the person on the left with the person on his right.
(ii) Relation of the person on the right with the person on his left. 

Type I (Relation of the person on the left with the person on the right)
A + B means A is father of B.
A – B means A is mother of B.
In both these cases, we are given the relationship of A, who is on the left with the person B who is on his right. We start from right and move towards left. As such we call it ‘Relation – Back’.
Example: If it is given that:
(i) ‘A+B’ means ‘A is the father of B’
(ii) ‘A – B” means ‘A is the mother of B”.
(iii) ‘A ´ B’ means ‘A is the brother of B’
(iv) ‘A ¸ ‘B’ means ‘A is the sister of B’.
What is the relationship of P with R in the equation: ‘P + Q x R’.
Solution: 
Step 1: (Identification of the TYPE): We note that this is Relation – Back type of case as we are provided with the relation of person on the left with the person on his right.
Step 2: (Identification of the SYMBOL) We find that the sign ‘x’ between two denotes that the person on the left is brother of the person on the right. Following the  lead, we note that Q is brother of R.
Step 3: Similarly, we can find the relationship between P and Q. The symbol joining them denotes that the person on the ‘left’ is father of the person on the ‘right’ side of the symbol. So P is father of Q.
Step 4: Since P is father of Q and Q is brother of R, therefore P is father of R as well.
Ans.  P is father of R (and not the vice versa).
What is the relationship of ‘R’ with respect to ‘P’?
We cannot exactly denote the relationship of R with P because we are not given the information with regard to gender of R. R may be son of P or may be is daughter of P. So the exact relationship of P with respect of R cannot be certainly stated.
Type II (Relation of the person on the right with the person on his left)
X + Y means Y is father of  X
X – Y means Y is mother of X
In these case, we are given the relation of the person on the right with  respect to the person on his left. So we move from Left to Right and we call it ‘Relation – Forward’ type.
Example: If it is given that:
(i) ‘A + B’ means ‘B is the father of A’,
(ii) ‘A – B’ means, ‘B is the wife of A’,  
(iii) ‘A × B’ means ‘B is the  brother of A’  
(iv) ‘A ¸ B’ means ‘B is the daughter of A’.
What is the relation of U with S in the statement S ¸ T × U.
(a) U is the son of S
(b) U is the aunt of S
(c) S is the aunt of Z  
(d) S is the mother of U
Solution
Step 1: (Identification of the TYPE): When we look at the matrix provided to us, we find that it is ‘Relationship –Forward’ type of case since we are provided with the relationship of the person on the right with the person on the left.
Step 2: (Identification of the SYMBOL) We note that the sign ‘¸’ between the two persons denotes that the person on the right is the daughter of the person on the left. Following this lead, we conclude that T is daughter of S.
Step 3:   Next we note that the sign ‘x’ denotes that the person on the right is the brother of the person on the left side of the symbol. From it we conclude that in the equation ‘T x U’, U is brother of T.
Step 4:  From Step 2, it is observed that T is daughter of S and from Step 3 we find that U is brother of T, so U is son of S.
Ans. U is son of S.
Sometimes, the relationships are given to us in the form of some other symbols as well like ‘D’,    or ‘ # ’ or ‘$’ or ‘@’, etc. The format followed to solve the question is the same as discussed above.

Type III: (Mixed Coded Relationships)
The directions may contain the information wherein both type of cases such as ‘Relation- Back’ and ‘Relation-Forward’ may be given.
Example:
Directions: (1-2)  If it is given that
(i) P x Q means Q is mother of P
(ii) P + Q means P is father of Q
(iii) P – Q means P is brother of Q
(iv) P,  Q means Q is sister of P

Q.1. Which of the following means “M is niece of T”? 
(i) M, D+ T x R
(ii) T–D+R, M
(iii) T x D + R, M
(iv) M x D + R, T
Ans. We can also solve these type of questions by options. We observe in the question that the gender of M is female and according to the given statements x and, signs should come before M. So we can check (2) and (3) options
(ii) T – D + R ¸ M
M is a sister of R; D is a father of R; T is a brother of D. So, obviously M is niece of T.
So, answer is (ii).

Q.2. Which of the following statements is redundant to give answer of Q No. 1? 
(i) I only
(ii) II only
(iii) either I or II only  
(iv) All are required
Ans. To solve the 1st question we need the relation of father, brother and sister. So, statement I is redundant.
So, Answer is (1).

Example: If 
(i) (A+B) means A is brother of B
(ii) (A – B) means A is sister of B 
(iii) (A x B) means A is wife of B 
(iv) (A¸B) means A is father of B 
then which of the following indicates ‘S is son of P’? 
(i) P x Q, R + S – T
(ii) P x Q, S – R + T
(iii) P x Q, R – T + S                  
(iv) P x Q, R – S + T
Solution. For S to be son it has to be male and for male we need + and¸ signs before ‘S’. So, we can easily eliminate 1st, 2nd and  3rd  option.
But (4th) option fulfills our condition. So, we check the 4th option
P x Q ¸ R – S + T     which says S is a brother of T; R is a sister of S.
Q is a father of R and P is wife of Q which shows that S is a son of P. So answer is (4).

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