@employee582971@Gosleepriya And you fell flat..:it's 12. The same girl is all 11 sons' sister. His daughter has 11 brothers and they all have the same sister.
@Liamnc7p@Gosleepriya Actually if you thought of the fact that his sons are brothers and if they all have a sister....that 1 daughter is a sister to all 11 sons. So maybe put your own mind to word before you call others' answers dumb when you're the dummy here.