εἰλίονες
From LSJ
κρατίστην εἶναι δημοκρατίαν τὴν μήτε πλουσίους ἄγαν μήτε πένητας ἔχουσαν πολίτας → the best democracy is that in which the citizens are neither very rich nor very poor (Thales/Plutarch)
English (LSJ)
poet. pl., =
A brothers-in-law, whose wives are sisters, Pollux 3.32. (Prob. metri gr. for Ελίονες, cf. ἀέλιοι, OIcel. svilar (same meaning), Skt. syālás 'wife's brother'?)