This reminds me of situations where a person marries someone believing they will change. Change doesn't happen and everyone is miserable. Seems to me both of your parents are being selfish and irresponsible. They brought him home, but don't take responsibility for him.
My first suggestion was going to rehome him some place where he could burn off some energy. That's a nonstarter.
Do you have a fenced yard where he could run around? Or maybe trips to a dog park to run with other dogs?
If he's not neutered get that done.
You said he's 7 months old. He is still a baby. He needs someone i.e. your parents to take responsibility for his training. He is a combination of two working breeds. If humans don't give him a job, he is going to create one for himself.
Is there a way you could discuss the situation with your parents, pointing out current circumstances are not fair to you or Doc? I remember you had to prove you would be responsible before you got Evie. They need to step up to the plate.
Good luck to you.