Thanks for your thoughts bjrose. I always thought identicle twins ran in families, not fraternal twins. My hubby's dad is a fraternal twin, has a twin sister.

Guess I just have to wait and see...........

I always got told identical twins were heridtry (sorry i can't spell) as my mum is an identical twin... but i've been researching lots and apparently they aren't. it's the fraternal that are. good luck