son / child
figli
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Figli (plural) can mean 'children' (sons and daughters combined). 'Figlio unico' means only child. In informal speech, Italians often refer to their children as 'i ragazzi' (the kids/young people).
Il loro figlio maggiore ha appena compiuto diciotto anni.
Their eldest son has just turned eighteen.
Hanno tre figli: due maschi e una femmina.
They have three children: two boys and one girl.