systkin

Etymology
From.

Noun

 * 1) siblings

Etymology
From.

Noun

 * 1) siblings; brother(s) and sister(s)

Etymology
Derived from (or more correctly an old adjectival form of it, ) with the suffix  indicating a relation between people as in the words  and. Unrelated to the English.

Noun

 * 1) brothers and sisters; siblings