Why do you assume I wouldn't love my child?
I'm not at all accusing you of not loving your hypothetical child. I'm simply pointing out that by being so intolerant of their lifestyle (getting pissed when they bring their partner around) you're making life a lot, lot harder for them than it needs to be.
I share Cathcons views. If I had a straight child, I'd love him/her, but I would not have to like his wife or her husband. The same goes for a gay child. Its not place to deny my hypothetical gay child their right to marry (thats why I support same sex marriage at a state level) however.