Blood Relationship is considered to be one of the most important topics of logical reasoning section for any Entrance Aptitude test or competitive exam. The students must have precise knowledge of blood relations in order to solve variety of questions.

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Formula's for Blood Relation

Mother’s or Father’s Father	Grand father
Mother’s or Father’s Mother	Grand mother
Mother’s or Father’s Son	Brother
Mother’s or Father’s Daughter	Sister
Mother’s or Father’s Brother	Uncle
Mother’s or Father’s Sister	Aunt
Husband or Wife’s sister &  Brother’s wife	Sister in law
Husband or Wife’s brother &  Sister’s husband	Brother in law
Son’s Wife	Daughter in law
Daughter’s Husband	Son in law
Brother’s or Sister’s Son	Nephew
Brother’s or Sister’s Daughter	Niece
Uncle or Aunt’s Son/Daughter	Cousin
Grandson’s or Granddaughter’s Daughter/Son	Great Grand Daughter/Son
Husband or Wife	Spouse
“Real” brother or sister	Siblings

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There is a standard set of symbols which help one decode family relationship, Below is list of such symbols.  Family Tree Notations: 

Conditions: 

• Don’t judge the genders on the name basis. 
• Using the hints like “he”, ”she”, the gender must be considered. 
• Be aware of the word “Only”. 

Relations from one generation to next: 

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