Sure, if there is some kind of neglect or violence being committed towards the children. From what I've read, there seems to be a wide variation of opinons about how bad this all is for the kids. If a child is being truly neglected or abused, I wouldn't think the opinions would vary this much.
We have a family of 6 that goes to my church and the oldest boy is often seen carrying the baby, giving him a bottle or playing with him. I think it's sweet that he does that-not abusive. He's probably going to make a great father someday because he already knows how to be loving and tender towards a child.
Having household chores to do is not abusive, as much as I tried to convince my mother that it was!