Equal unto the angels (isaggeloi). A rare and late word from isos, equal, and aggelos. Only here in the N.T. Mark and Matthew have “as angels” (hōs aggeloi). Angels do not marry, there is no marriage in heaven.
Sons of God, being sons of the resurrection (huioi theou tēs anastaseōs huioi ontes). This Hebraistic phrase, “sons of the resurrection” defines “sons of God” and is a direct answer to the Sadducees.