The post from Sharylesley said it all but I will go one step further. Only a totally irresponsible person would allow their animal to have two litters so close together. Registered Dog breeders answer to the strict code of ethics demanded by canine control govering body apparently sadly lacking in the Feline world. The kindest thing you can do for this poor creature is have her DE-SEXED your Veterinarian will explain in detail in case you have never heard the word. And if financial issues prevent this surrender her to the RSPCA and they will place her in a responsible caring home God help her if she remains with you.
Male cats instinctively kill young kittens (happens in all the cat families - lions etc) - it's about remaining the alpha in the group, and also about ensuring that their own genetic offspring are the only survivors - remove the male cat from the new kittens until they are old enough to survive, otherwise he may kill them.
Please stop letting the cats breed! Have 'all' of them spayed or neutered! In the meantime, simply keep the male kitty that is hissing away from the new kittens!
There are already so many pets who live horrible lives and die needlessly when humans are not acting responsibly!
If the young male cat has not been neutered he may very well kill the kittens. Also if the queen cat has not been desexed you may find that the young male will try to mate with her. He will not see her as "Mum" but as a mating partner. It is advisable to have all cats/kittens desexed as not doing so only perpetuates the problem of feral and unwanted cats/kittens.
It's only been one day. I'm not surprised that your young cat is hissing at the kittens! After a while he might chill out and learn to live with/accept the kittens. I think it's too soon to tell.
But, Shelly, maybe you should get your mama kitty fixed. She had a litter in June and had another litter in October? That's a lot of kittens. It's better for her health in the long-run. We have three cats. The oldest came to us fixed (adopted from an animal sanctuary), the second was fixed as soon as she was old enough, and our kitten will be fixed as soon as the vet says it's okay. (Sorry if I sounded preachy - I just feel very strongly about it!)
Best of luck with all the adorable kittens and your young cat (mama, too!). Hope they're all healthy and get along well!
We took a feral pregnant cat into our house a few years ago, and she did the same thing. She killed all of the kittens except one, and she was very protective of the one that lived. When the kitten was old enough she left with the kitten, and we never saw them again.
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