A Sib

1. Kindred; kin; kinsmen; a body of personsrelated by blood in any degree.
2. A kinsman; a blood relation; a relative, near or remote; one closely allied to another; an intimate companion.
3. A sibling, brother or sister (irrespective of gender)
4. (biology) Any group of animals or plants sharing a corresponding genetic relation
5. A group of individuals unilaterally descended from a single (real or postulated) common ancestor