Tricks to Solve Blood Relations Problems in Logical Reasoning

Tue Sep 15, 2020

Blood relations are of impressive piece of CAT and other MBA placement tests. Around 3-4 questions make up its consistent thinking segment. This subject is a scoring one in the event that you are smooth with the comprehension of family relations and genealogical record else it can end up being chaotic, confounding and tedious. Lately, we are probably been isolates with our relatives and generally live in family units dissimilar to in past occasions when the idea of Joint Families was a clear aspect of our way of life. Consequently, the greater part of us scarcely have how family relations are interwoven and stirred up and how the branches course through the family. The accompanying table will give you some thought of phrasing of relationships.

Father of grandfather or grandmother	Great grandfather	Daughter of father or mother	Sister
Mother of grandfather or grandmother	Great grandmother	Son of second wife of father	Step brother
Father of father or mother	Grandfather	Daughter of second wife of father	Step sister
Mother of father or mother	Grandmother	Son/daughter of uncle/aunt	Cousin
Wife of grandfather	Grandmother	Brother of husband or wife	Brother-in-law
Husband of grandmother	Grandfather	Sister of husband or wife	Sister-in-law
Father-in-law of father/mother	Grandfather	Husband of sister/sister-in-law	Brother-in-law
Mother-in-law of father/mother	Grandmother	Son of father	Oneself/Brother
Father’s father/mother only	Father	Mother of son/daughter	Oneself/Wife
Only daughter-in-law of father’s father/father’s mother	Mother	Father of daughter/son	Oneself/husband
Husband of mother	Father	Son of son of grandmother/grandfather	Brother/Oneself /Cousin
Wife of father	Mother	Daughter of son of grandmother/grandfather	Cousin/Oneself /Sister
Second wife of father	Step mother	Son of brother or sister	Nephew
Brother of father	Uncle	Daughter of brother/sister	Niece
Brother of mother	Maternal Uncle	Grandson of father/mother	Son/Nephew
Sister of father	Aunt	Granddaughter of father/mother	Daughter or Niece
Sister of mother	Maternal Aunt	Husband of daughter	Son-in-law
Husband of aunt	Uncle	Wife of brother/brother-in-law	Sister-in-law
Wife of uncle	Aunt	Wife of son	Daughter-in-law
Son of grandfather/grandmother	Father/Uncle	Son of son/Daughter	Grandson
Daughter of father-in-law/mother-in-law of father	Mother/Aunt	Daughter of son/Daughter	Granddaughter
Father of wife/husband	Father-in-law	Son’s/Daughter’s grandson	Great Grandson
Mother of wife/husband	Mother-in-law	Son’s/Daughter’s granddaughter	Great granddaughter
Children of same parents	Siblings
Father’s/Mother’s only son/daughter	Oneself
Son of father or mother	Brother

The questions on blood relations are of following three types

Based on statements/ conversations
Based on puzzles
Based on codes

Since I have already discussed coded relationships, in this blog, I’ll explain techniques and methods to solve the other two kinds.

Let’s start with the first one

BASED ON STATEMENTS/ CONVERSATIONS

The questions in this classification are commonly a discourse/conversation between two individuals and caught up with an inquiry based on data gave in the conversation. Given beneath are a few examples of this sort alongside the technique to unravel them.

Ram said to Hari.” The boy playing with football is the younger of the two brothers of the daughter of my father’s wife”. Then how the boy playing football is related to Ram?

Pointing to a man in the photograph a woman said, “His brother’s father is the only son of my grandfather”. How is the woman related to the man in the photograph?

Mother
Aunt
Sister
Daughter
Grandmother

The approach you need to follow to solve these questions is Backtracking.

Backtracking means beginning with last information and proceed backward. For example, if it’s given that he is the son of the mother of my grandfather’s daughter, then we start with the last information provided: ‘Grandfather’s daughter’.

Now, Grandfather’s daughter means Aunt (sister of the father). Now, mother of my grandfather’s daughter becomes ‘mother of my aunt’ hence grandmother. Therefore, son of my grandmother become either my father or uncle.Now let’s try this technique in the example given above.

Example 1: “The boy playing with football is the younger of the two brothers of the daughter of my father’s wife.” Here the last piece of information is.

Blood Relations Problems

Example 2: “His brother’s father is the only son of my grandfather.”

Now we can move on to the second kind of problems

BASED ON PUZZLES

In this sort, normally set of data is surrendered followed with arrangement of questions. What's more, with the assistance of this information. you have to address those questions. The strategy to solve them is family tree diagrams.

you can draw tree diagrams in the following fashion.

Use vertical lines to represent parent-child relationships.
Horizontal lines like <-> to denote marriages and dashed lines to represent sibling relationships. Apart from that, a sibling relationship can easily be established if they share the same root.
You can also add gender differentiation to it by using a + sign for male and – sign for female.
You can use (?) for the information that has not been provided to you.

As we have now understood the method to draw the diagram let’s move forth and practice some questions.

Example1: In a family, there are six members- A, B, C, D, E and F. A and B are a married couple, A being a male member. D is the only son of C, who is the brother of A. E is the sister of D. B is the daughter-in-law of F, whose husband has died.

How F has related to A?

Mother
Sister-in-law
Sister
Mother-in-law
None of these

How is E related to C?

Daughter
Aunt
Cousin
Sister
Mother

Who is C to B?

Brother
Brother-in-law
Son-in-law
Nephew
None of these

How many male members are there in the family?

Two
Three
Four
Five
One

To solve such questions

Read the data quickly. This would provide the feel of the problem.
Separate the actual information, the usually stated information or the negative Information.
Each of the actual information would give you some information that can be used to draw a part of the family tree. It is advisable, to begin with, a sentence that gives information about the parent-child relationship. Grandfather-grandson relationships and brother-sister relationships should be touched later.
Go on reading actual information, one by one, and make diagrams for each of the information. These diagrams would be like parts or components of the final family tree. Simultaneously try not to draw additional tree diagrams for each new piece of information that you read. Instead, try adding information to the existing tree diagram on reading the new information. The usually stated information or negative info. Would be of immense use in this regard.
Finally, with the help of all given info. etc. combine all the components into the final diagram.

Now let’s solve the problem given above

Sol 1: The first sentence is USI while all other are is actual information. Since, as suggested above we should begin with the parent-child relationship. And the third sentence depicts parent-child relationship i.e. D is the only son of C who’s a brother of A. Therefore, the diagram is as follows

Now we should look info. that tells more about A, D or C. The second sentence tells us more about A. So, we’ll incorporate that into the diagram.

Now we shall add the leftover information and the one that fits the most in the current diagram is the relationship between D and E.

Blood Relations Problems in Logical Resoning

We have finally reached in the position of completing our tree diagram by incorporating the final information which is about F who is a female since her husband had died. And B is her daughter-in-law. Therefore, she’s the mother of A and C.

Tips to Solve Blood Relations Problems in LR

Since we are done with the family tree we can easily answer all the above question on the basis of this diagram.

Team Headache

Tricks to Solve Blood Relations Problems in Logical Reasoning

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