I think it's just his personality and he sounds a little like Jack. The type of dog that needs steady discipline and boundries, and when they're lacking he will take over. Jack gets away with everything when I'm not home, and is quite unruly. But if I'm there he doesn't act the same way.
For him to take you seriously, you need to enforce the rules and let him know that he has to listen to you too. I'd feed his entire meals by making him work for you - doing a sit, down or anything else he knows.
The chewing could probably be because he was bored. I'm not sure how much time your dad spends with Hank versus how much time you spent with him. A tired dog is a happy dog. The more exercise he gets, whether it's a walk, playing "chase me" in the backyard..the happier he'll be.
Some dogs are just harder work than others. We were blessed with our first dog, Shadow. She was the easiest dog in the entire world. Then we got Jack Russells and had a crash course in dog training and found out what it's like to have dogs with issues.
Good luck, I hope everything is more normal once the family returns.
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