ἀδελφότεκνον

From LSJ

ἀνήρ τῷ ἀδελφῷ αὐτοῦ προσκολληθήσεται → a man cleaves each to his fellow, each to one's fellow

Source

Spanish (DGE)

-ου, τό
sent. dud. sobrino o primo, Klein.Türsteine 372 (Frigia III d.C.)
sobrino, IPhrygie 4.47.6 (crist.).