The answer is what kind of hamster is it and I know you should keep the mom away from the babys and when the babys are adults keep them away from each other to
My hamster that grew up together do not fight each other, but when they got separated for a month or more and I put them back in one cage, they attack each other. If they never grow up in the same cage, they tend to kill each other (my hamster was hurt terribly after I wanted them to make friends with each other)
Will baby hamsters kill each other and if they do why
Hamsters when mature are solitary, and will fight for their space. You need to separate the older ones now, or rehome them. Where is dad? Are you just going to keep breeding or are you going to keep him separate too? You need to think about this. Hamsters do not need company.