Hmm...I don't know if I have had this conversation, in seriousness, or not. I do consider my kitties (and puppy) 'my kids'. I possibly don't face this question as much as a married woman might, though.

But, bisi.cat and Kirsten, you can only be offended if you let yourself. Just smile and say, "what an interesting statment that is". I wouldn't be offended, but, would instead, act as if the other person is slightly off for saying such a thing.