Sib \Sib\, n. [AS. sibb alliance, gesib a relative. [root]289. See Gossip.]

A blood relation. [Obs.]

--Nash.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Sib \Sib\, a. Related by blood; akin. [Obs. or Prov. Eng. & Scot.]

--Sir W. Scott.

Your kindred is but . . . little sib to you. --Chaucer.

[He] is no fairy birn, ne sib at all To elfs, but sprung of seed terrestrial. --Spenser.

Source: Webster's Revised Unabridged Dictionary (1913)