Ok, from what I understand, your father's genes DO count. If the women in a man's family tend to release more than one egg, that trait can be passed onto his daughters. So if twins ran in your husband's family but not yours, it would not increase your chances of twins, BUT that trait could be passed onto your daughters. But since twins do run in your family, even on your father's side, that trait can be passed on to you. Twins run in my family on my father's side but not my mothers and I have fraternal boy/girl twins. Twins don't run in my husband's family but it would not have affected us conceiving twins anyway.
As far as wishing and hoping for twins, I did! I desperately wanted twins and I got them. I know many women who wished for twins and got them. In the book Having Twins, Elizabeth Noble talks about how women can "will" their bodies to release more than one egg, if you believe that sort of thing. Twins CAN be high risk but don't have to be, and aren't always. I carried my twins to 40 weeks 1 day and they were born at home in the water with no complications. My girl was 6 lbs 10 oz and my boy was 8 lbs 4 oz. I am truly so sorry to hear about the mamas who had complications with their twin pregnancies. Those things can happen and do happen, and those circumstances and very real and heartbreaking.
But I just wanted to point out that twin pregnancies don't have to be high risk and they can be very successful. Anyway, twins are SO MUCH WORK. So much more than I ever could have imagined, but I would not trade them for the world. Even though I feel like I am losing my mind, I love having twins and I would actually like another set one day. A LONG time from now.