Sib

Part of speech: noun (n.)

A blood relation. [Obs.] Nash.

Part of speech: adjective (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.