Welcome to the forum Cstar77872. First, really sorry this happened. Tough situation but really not a hard decision. I would let your vet do a physical exam and see if there is a curable illness that caused the dog to react that way. If not then I would put the dog down while it is there. At no age should a balanced dog have human aggression. As soon as you mentioned that there are children in the household it would be a very fast choice, the dog needs to be put down. I am fully aware how attached you can get to a family dog but this is not an accident or a quick nip as a warning. This is a full out attack. For me a no brainer, the dog could never be trusted not to do the same thing to anyone. Best of luck with things.