What can I do about my cat? I'm at wit's end!?

i mostly know how u feel i also have an over weight cat who is very big and thinks shes gotta hog all the food she dont chew the food she gobbles it whole i also have 2 feeders ive got 3 cats i used 2 feeders because the mamma cat wont let her kids eat and she gets mean if u try to take the food from her so the kids can eat too the youngest is a runt who is 5 years old and very small. so i haft to find ways to accupy the momma so the kittens cat get food the mamma cat guards both feeders and thinks there all for her when there not she hisses growls bites claws i pick her up and take her to another room and intertain her by toys and kitty treats that way the other cats can have a chance to eat try a watebottle and spray ur cat everytime she does her bad behaviors and point ur finger at her and tell her no, no more bad kitty but make sure she knows shes in trouble and ur not going to let her get her way. and another thing is u can take her into another room and feed her then put the rest up so she cannot get to it and then later bring it down so she can eat more. just make sure ur not feeding her too much. i leave both feeders out full of food at all times im so scared that the other 2 will not get enogh to eat so my 2 wait until there momma is gone and then she eats while i got the momma on my lap in front of my computer in my bedroom i hope ive helped u have a great night good luck