πατραδελφία
From LSJ
οὐκ ἔστι λέουσι καὶ ἀνδράσιν ὅρκια πιστά → there are no pacts between lions and men, between lions and men there are no oaths of faith, there can be no covenants between men and lions
German (Pape)
[Seite 535] ἡ, Verwandtschaft durch die Geschwister des Vaters, Vaters Bruder- oder Schwesterkinder, v. l. bei Aesch. für πατραδελφεία.