It should've been put on in the Lounge, not here. This is a board for names, not for topics about anything else (although sometimes name topics get off topic... but then you should move it to the Lounge).
And for the record, twins run through the female side of the family only.
Unless, theoretically, the father contributes some gene or something to his daughter that makes her more likely to produce more than one egg a month.
Twins only occur naturally in one in 80 births. (Triplets are one in 8,000.) This of course varies among ethnicities--Caucasians have the highest rate of twinning, while Asians have the least--, and it's also influenced by the diet and the age of the potential mother. This all goes out the window if you're using fertility drugs, though, of course.
Miranda