Help with aggressive three year old puppy

We are short on time, that is true but we do work with him quite a bit. He is a family pet so he is around people quite an big and my husband works from home so he doesn’t lack for companionship, it is hard to express my whole situation in a paragraph. My kids play with him daily and he is well loved and cared for. He is exercised and played with. I’m pretty frazzled because he just bit my other dog and I don’t know what to do. He has come so far and done so well. We do not have time or money for rigorous training schedules. I think we inherited a broken animal and we are trying to fix him. We did not realize how bad he was when we go him. I hate to throw in the towel but nobody has time to walk him or train him for hours a day. I was just hoping if anyone had tips that could help.

/r/Dogtraining Thread Parent