Wait.... so...

The first couple of weeks, in the crate, he slept all night? And since being out of the crate, he isn't sleeping, but instead is chewing on things through out your room?

Hmmm. I guess the obvious solution here is back in the crate! : ) Seriously. At 1 1/2 years old (and quite possibly younger, because no one knows for sure) many dogs are still adolescents and cannot be trusted with complete freedom. Put him in his crate to sleep. Give him a safe chewy (like a bully stick) or a stuffed & frozen Kong to get out his urge to chew and tire him out a little. Remove his crate pad if he is trying to chew on it, and replace that with a sheet or a towel.

A lot of people think that ONLY physical exertion is important for dogs, but it isn't! It is essential but mental exertion is just as important. Start with the basics (if you don't already have those down)... sit, down, stand, stay, wait, come, heel, etc. Practice them for 15 minute sessions, as many times per day as you can. Practice them for 2 minutes during a commercial break. Every little bit counts, and will result in a more mentally stimulated, not to mention more obedient dog. Progress from that up to more challenging commands, tricks, and longer down/stays, and long-distance recalls. Encourage your Dad to practice these with him, while he's home during the day.

You can also play "games" with him. Hide treats around the house, and send him off to find them. Instead of pouring his kibble in a bowl for dinner, pour it in a treat ball (like a Buster Cube or a Tricky Treat Ball), so that he has to work for his food. Appropriate chew toys, raw bones if you're comfortable with them, and stuffed/frozen Kongs will alleviate his desire for destruction, as well as tire him out! It might be a good idea to prepare one of the above and ask your Dad to give him one when he lets him out, if he flat-out refuses to exercise him.