Quote Originally Posted by тыры-пыры
если только множ. число ДЯДЬЯ
That is very correct!!! A bit old-fashioned though .. Excellent joke, тыры-пыры!

The modern usage would still prefer дяди as in:

Оба моих дяди - прекрасные люди.

The traditional form "дядья" is still present in literature to specifically indicate historical context as in:

Все мои дядья и кумовья - прекрасные люди.