ترجمة - سويدي-إيطاليّ - Hej jag heter Alexandra, och har en lille bror...

Isn't fratello just 'brother'? What about 'lille'?

Yes, i think it's "younger" brother.

CC: Porfyhr

Yes, it is a clear distinction when you write "lillebror" instead of just "broder". As Xini suggested the proper translation should be 'younger brother'.