I'd just like to protest at the title as "Catholic parents" is misleading and unfair to a large number of decent Catholics.
How do I know this?
My partners family are Catholics. I'm not saying they didn't struggle with the issue at first - but they are now just as accepting as my largely agnostic family are. I feel sure this applies to many, many Catholics worldwide; who despite the teachings of their Church use birth control, accept gay people for who they are and are generally just quite nice ordinary/extra ordinary human beings.