Heh…intact cats of opposite sexes = kittens. No exceptions. Not even if they’re mother/son.
My uncle (a truly tale-worthy mix of mushy sentimentalism, devout Catholicism and bipolar disorder) lived for years next door to my aunt’s house (which was originally my grandparents’ house, and the house my mother and her siblings grew up in) in an upstairs duplex. During this time, he started to feed a stray tortoiseshell cat, who grew pretty attached to him. When the city eminent-domained the whole block to put up a middle school (destroying beautiful Victorian houses to construct a monstrosity that wouldn’t look alien as part of a Soviet sports complex), he moved to an apartment, taking the cat with him (yes, it could very well have been an indoor/outdoor cat and he stole it unwittingly from its loving family…it would possibly be the least of his transgressions, even just in relation to pets). As it turns out, the cat was pregnant.
The litter was six kittens. Two of our current cats came from that litter, and he got rid of the rest through a newspaper ad. Now, at this point, the city hadn’t done any demolition on the block it e-d’ed, so now and then my uncle would take the cat back to the old neighborhood and leave her overnight, because “she was homesick”. (Seriously…that’s a quote)
Guess what? Penis ensued on one of these camping trips and the cat was pregnant again. Only this time, he kept two, a male and female. And didn’t get anyone snipped. Because he couldn’t stand to cause them pain. (Again, seriously)
So, just to keep everyone on track…Three cats. Two females. One male. See where this is going?
So, several months later, my mother gets a phone call. And my uncle is just SHOCKED that son cat would do that to mom cat! Don’t they KNOW!? (Seriously…he expected a male cat not to go after its mother in heat. Because it’s morally wrong. Cats. nods)
Suffice it to say that I could go on about this through another four litters, 24 cats in a studio apartment, him losing the apartment because of the cats, him trying to keep the cats in a rental storage shed so he wouldn’t lose the apartment, him getting reported for keeping the cats in the storage shed by the watchman who heard them crying, him taking the cats to an abandoned warehouse where he hoped to continue feeding them and having them as pets he could visit, someone poisoning them (it was horrible and really cruel), my uncle going into such mourning grief over them that he’s now a vegan…long story, all learned secondhand from my mother (I live a good three hours from them).
Anyway, yeah…look at a female cat in heat wrong and she’ll pop with kittens. Nature really LOVES feline fecundity.