That's a series concern ... we got our cat when two of our friends who already had cats got married. Our Agnes insists on being the only animal in the home - she even dipped one of our fish out of the bowl and ate him!
She also had a nervous breakdown when our first child was born, and the vet had to tranquilize her for a couple of months while she got used to it. She's maintained an armed truce with all the kids since then; she bites them if they annoy her, and we say, "Serves you right!"
But for real ... marriage is worth the work, and provides extra people to nurture the cats :-).