On the topic of parental acceptance on coming out. I think its best to keep an open mind. You never know how it will turn out. I think its safe to say you know how it will start. Sure they will find it hard to accept. They may say some things that they will regret later.
My mom has had her own strange journey. I remember growing up hearing all the degratory comments about gay people. However, after I came out it forced her to deal with the issue. Now she is a member on a pro gay jw forum. It's very strange to say the least, but I work with it thinking she is half way there. She still believes that gay jw's can live happy lives totally celibate, including no masturbation. That is rediculous of course unless you set out to raise a eunuch! I realize she still doesn't understand its not about sex, its about finding love in a life partner and for gay people that happens to be someone of the same sex.
I could go on, this is one of my favorite topics. I think the best thing to keep in mind is time is on your side...people do come around in their own way eventually.