Here are some strange observations for you.....I have found that my parents are color-blind, but can be culture biased.....in other words, if you ACT white, then everythings ok. Sooo - the color of my 'kids' wouldn't matter, but how they 'acted' would! :/
My grandfather, when hearing of my decision to foster and foster/adopt, asked my mother 'what color is she gonna get' ( he knows me well). I told her the next time he asked, tell him green.
Funny thing is, EVERYONE loves the kids....no matter what color they are (though my mother still finds my slathering of my aa kids with vaseline, lotion, oil, etc a bit off-putting
)
I tend to not notice other's reactions when I am out and about (something I will need to become more aware of as the kids will certainly notice) and since I am WHITE (refering to my extra-pale skin tone) I am sure we get a lot of looks. However, I find my blissful ignorance to be helpful in stopping comments. When someone asks about the kids, I give them a big gleeful smile and say "yep! They're mine" and find that they just give me a confused look but stop there.
Talk to your dad - maybe helping him to understand that they will be 'your' kids will help? You should have seen my mother playing with my fs in the pool she bought him. They were both having so much fun - a child's glee transcends a lot, I find.