Can My Twin Cat's Sister Nurse Her Babies?

Okay, So I have two female cats.
Olive and ginger, a pair of female twins.
So, when Ginger gave birth she didn't take care of her kittens she was too distracted with olive's babies. But, we solved that solution already. She cares and is loving for her babies now. So, we usually let Ginger go out at times she wants to leave the room she's in. (It's locked just for her kittens and her) When we do let her go out though, she will try to nurse her sister's babies? I'm questioning if I should let her nurse them or not? I read online when she does give birth she cannot nurse her sister's kittens, but now I'm not sure. So can she nurse her sister's children or not?
Another topic I wanted to ask about is how to calm Ginger down to not mix the litters together? And, when can I mix litters?

 

okay! thank you.

 

We do have one male cat in our house. But no, we cannot keep them away from him because he is the one who usually goes to them.
No, we have a good clinic in my area but I don't feel we need to go to a clinic for this problem.

 

Thanks a lot! Yes we are getting all of them neutered very soon since we can't handle the kittens after kittens. But, I really wish we could take care of more them. And it's not good for Ginger and Olive's health as you said, we can't risk our angels getting hurt either so we'll be careful. Thank you again! Our cat's room right now is occupied by ginger and her newborns. But they do usually come in my room since it's Olive's favorite spot, they usually hang out here. But, you're right when Ginger's kittens become 3 weeks I'll mix them if that's the age?

 

Okay, thank you! But I wanted to ask if Ginger nursed her kids, all six of them cant usually get milk, so we bring Olive in. She feeds them, But you're telling me its okay, and I totally believe that but if the kittens are not healthy or sick can they pass it on to Olive's babies? Since one of them is still drinking milk from her. So it's totally okay? (Sorry for the dumb question I just don't want any of them getting sick or anything)

 

Also, can Olive by any chance get sick?

 

I'm not sure. But all of them move like normal kittens, the thing is we've always had kittens who struggle and move, their faces and pretty different then all of the other kittens we've had. They don't seem like the other ones for some reason, but they're pretty healthy. They do walk but never struggle and are adorable. They can swallow on their on (they ate litter I got it out of their mouths it happened to all of the kittens) But, if something does happen we are going to bring them to the vet. But right now everything seems normal, so their probably alright. (as in these kittens are the kitten you see on videos, They dont catch onto you like other ones do unless they're stuck on your back)

 

Okay, so should I give the kittens who don't get milk a replacement of their mom's milk? We'll get one if needed.
Thank you for replying.

 

Okay, thank you. We'll be weighing them when we go out and buy some things for the house (we need to buy something we can weigh them on)

 

At the most, it's genetical.

 

So far, they are 12 days old (a week and 5 days) and thanks for the suggestion we'll do it.