I read somewhere that the male has nothing to do with whether multiples are conceived.

It's the female body that releases two in eggs (in the case of fraternal twins) and with identical twins the egg seperates into two after it's been fertilised.

Twins run in my side of the family as well as DP's, actually they've skipped a few generations... they've also skipped us, but might grab DP's sis. Now that would be funny.