Brother and Sister Concepts

A anniversary of the day on which a person was born (or the celebration of it).

Male characters that share the same parents.

Sexual intimacy between family members.

Someone or something that both has and raises children/offspring.

Sibling rivalry is a type of competition or animosity among brothers and sisters, blood-related or not.

Female members of a family that share the same parents.

Twins are children who are born on the same day from the same mother. Though not always identical.