My aunt got a kitten as well as us, it's Stewies brother. She had a cat before this and she just got spayed. Now, when they brought the new kitten in she started acting like its mother. Picking it up, following it and everything. She won't let the little guy even eat. And this cat is a year old and the kitten is about 6 weeks old. Has anyone ever had this happen when they got a kitten? And when will it stop?
One of my cats did the same thing when we brought home Sophie and Sorcha as kittens (8 weeks and 9 weeks old, respectively). They were already weaned, but Cassie was convinced it was her job to let them "nurse" from her, give them bathes, etc. She even weaned them for the second time. So yes, as the kittens grow up and act more cat-like instead of kittenish (6 weeks is a little young to be away from mom anyway)the older cat will stop the mothering. However, Cassie does have a stronger bond with the two cats she "mother-henned." She enjoys their company more, nap together, share food, and groom each other more than the other cats.
I'm assuming it's the same with cats as it is dogs. It's not so much the weening that's the issue it's the interaction with mom and littermates as to why 8 weeks is the earliest an animal should be sold/given away.
Kittens should be left with their mother until 8-10 weeks old, is what I've usually read. If they are seperated to soon, even after weaning, they are more at risk for developmental delays and behavioral issues such as seperation anxiety, excessive kneading or clawing, and false nursing. A goood mother would take this time after nursing to help teach her kitten socialization skills. I read somewhere that in some countries it is illegal to seperate kittens from a litter (whether there is a mother or not) before 7 weeks of age.