Problems on blood relations involve analysis of information showing blood relationship among members of a family. In the questions, as chain of relationship is given in the form of information and on the basis of this information, relation between any two members of the chain is asked. Students are supposed to be familiar with the knowledge of different relationship in a family.
| Brother's son | Nephew |
| Brother's daughter | Niece |
| Brother's wife | Sister-in-law |
| Grandfather's son | Father or uncle |
| Grandmother's son | Father or uncle |
| Grandfather's only son | Father |
| Grandmother's only son | Father |
| Grandfather's or Grandmother's only daughter-in-law | Mother |
| Mother's or father's mother | Grandmother |
| Mother's or father's father | Grandfather |
| Mother's or fatehr's son | Brother |
| Mother's or father's daughter | Sister |
| Mother's or father's sister | Aunt |
| Mother's or father's brother | Uncle |
| Son's wife | Daughter-in-law |
| Daughter's husband | Son-in-law |
| Uncle or aunt's son or daughter | Cousin |
| Sister's husband | Brother-in-law |
| Husband's sister | Sister-in-law |