Welcome to the forum. I would search for topics on NILF and 2 week shutdown. You can google both of them as well.
It is a tough position you are in. I don't envy it. I would be contacting a trainer ASAP, not letting the dog near the kids, and thinking if returning to shelter. Your kids safety is paramount, but this dog has had zero time to adjust. If you cannot be sure that you can manage the dog 100% of the time, until you get some professional help, then I would return the dog.
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