Thanks so much for the advice, you guys. I think I will say just that.
Also, I have read some of those custody stories. It seems to be that in most of those cases, someone (usually a grandparent) raised a huge fuss, causing the legal action. I am not sure what level of support (or non) we will recieve, but I really can't see any of our parents going to those lengths.
I will keep you updated. My mom DOES know that I began to have feelings for my then just-best-friend. I'm thinking this might not be THAT much of a shock.