ἀδελφιδεός
From LSJ
ὥστε ὁ βίος, ὢν καὶ νῦν χαλεπός, εἰς τὸν χρόνον ἐκεῖνον ἀβίωτος γίγνοιτ' ἂν τὸ παράπαν → and so life, which is hard enough now, would then become absolutely unendurable
Russian (Dvoretsky)
ἀδελφιδεός: стяж. атт. ἀδελφιδοῦς ὁ племянник (сын брата или сестры) Her., Thuc.