ὁμό-σπορος · homo-sporos — LSJ
sown together : hence, sprung from the same parents or ancestors, kindred, h.Cer. 85, Pi. N. 5.43, A. Th. 932 (lyr.), etc.: as Subst., brother, E. IT 611 ; sister, A. Ch. 242, S. Tr. 212 (lyr.), E. IT 695, Antiph. 18.
ὁ. γυνή a wife common to two (Laïus and Oedipus), S. OT 260 ; also of Oedipus, τοῦ πατρὸς ὁμόσπορος having the same wife with his father, ib. 460.