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This chapter will introduce you to the proper definitions of common relations, you will learn all the tricks necessary and will also learn how to avoid being tricked, while solving family tree based logical problems.

The very basics to solve the family tree problems are to know the various relations between the family members. And the actual problem arises when simple relation is defined in a typical way. So to make yourself able to deal with, study the following relations and the manner in which they may be presented.

Some Common Relations

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Sibling:

Person having one or both parents in common with another. Sibling can either be:

• Brother
• Sister

First Cousin:

First cousins are commonly known as cousin. Can be defined in following ways:

• Child of one's aunt or uncle.
• A relative descended from a common ancestor, such as a grandparent, by two or more steps in a diverging line.

Second Cousin:

• Child of one's first cousin.
• Child of a first cousin of one's parents.

Grandparent:

• The father of one's mother or father is called grandfather/grandpa.
• The mother of one's mother or father is called grandmother/grandma.

Uncle:

Term 'uncle' Can be explained in two ways:

• The brother of one's mother or father.
• The husband of one's aunt.

Aunt:

These two statements can define the term 'Aunt.'

• The sister of one's father or mother.
• The wife of one's uncle

Nephew:

Son of one's brother or sister.

Niece:

Daughter of one's brother or sister.

Brother-in-law

• The brother of one's spouse.
• The husband of one's sister.
• The husband of the sister of one's spouse.

Sister-in-law

• The sister of one's spouse.
• The wife of one's brother.
• The wife of the brother of one's spouse.

Relations are endless and to understand them properly, family trees need to be build with certain notations.

NOTATIONS TO BUILD A FAMILY TREE

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Notations are symbols that are developed to show

• A particular characteristic of a family member
• Or his/her relation with another member in family.

There are no standard notations. They can be formed as per individual discretion though it is advisable to develop easy notations and use a particular set of notations all time to make sure you draw family tree - Quickly & Accurately.

Following set of notation has all the mention properties.

1

A is a male:

2

B is a female:

3

Sex of C is unknown:

4

A and B are siblings:

5

A and B are married to each other:

6

A and B are C's children:

7

A is the uncle/aunt of B:

8

A is the only child of B:

How to make a family tree?

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To make a family tree from the given data, we should go step by step. Let's discuss this with the help of an example.

A, B, C, D, E and F are related to each other as given here.

• B is F's daughter in law.
• D is A's only grand child.
• C is D's only uncle.
• A has only 2 children F and C, one of them is male and another is female.
• E is the father of C.

STEP 1 : Identify the gender of Elements

While figuring out the genders of the elements(members of the family in the given question) both the points should be kept in mind.

1. The direct indications in the data given in question.
2. The data that generates from the other data.

S.No.	STATEMENT	IMPACT	NOTATION
1	B is F's daughter in law.	Means B is female
2	D is A's only grand child.	no means for gender point of view
3	C is D's only uncle.	Means C is male
4	A has only 2 children F and C, one of them is male and another is female.	we know that C is male from 3rd row, so F is female
5	E is the father of C.	Means E is male.

STEP 2 : Identify the generations in family tree

S.No.	STATEMENT	Number of generations
1	B is F's daughter in law.	2
2	D is A's only grand child.	3
3	C is D's only uncle.	2
4	A has only 2 children F and C, one of them is male and another is female.	2
5	E is the father of C.	2

Being one family, it can be said that there are 3 generations family, As there is no member above A and below D as per given data. Now members need to be arranged in tree.

STEP 3 : Identify the positions of Elements in family tree

S.No.	STATEMENT	REPRESENTATION
1	B is F's daughter in law.
2	D is A's only grand child.
3	C is D's only uncle.
4	A has only 2 children F and C, one of them is male and another is female.
5	E is the father of C.

Collecting them all together we get:

To test your understanding in regard you can attempt this Test on Family Tree.

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For more lessons and tests related to cat:

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