I'm am 18 weeks pregnant with my first child. I am caucasian and my husband is black (caribbean). Everyone in my family is very accepting of my husband and no one can wait for the baby to be born since biracial children are so beautiful! We actually have a few mixes in my family already: one cousin who is half mexican/caucasian and two that are half chillean/caucasian. It was more difficult for my paternal grandmother when she discovered I was marrying a black man but she handled it very well (didn't say anything which was a surprise to my aunts!) and she actually loves my husband so that's nice.
Also, my best friend is caucasian and her boyfriend is jamaican. They just had a little girl in april and she is absolutely beautiful.
I've learned to shrug off any shrugs we get here. We get more looks when the four of us are out than we do just as a couple simply because then there's more than one biracial couple to draw attention. Since i've been in the relationship i've also noticed more mixed couples than I ever did before (just more aware of it now I guess). So it's becoming very accepted here.
When I go to his island however, we get a lot more looks and comments. Many of his friends have gone away like he did and have ended up in mixed couples however if you're around people who don't know you, they stare. He even overheard one man speaking in his native tongue say "he thinks that's his woman!" and this angered my husband very much (as well as myself).
I find the best way to cope with stares is to make them stare. If someone spots us, I put my arm around him, hold his hand, give him a kiss, look at him adoringly with a huge grin (little things) anything to show that I am proud to be his wife and that I love him no matter what others see or think. It usually makes them stop staring...And makes me feel great!