I don't think your parents are being very fair. Some dogs take a while to unlearn bad habits. However, I also see that they don't want to be responsible for training the dog. If it's your dog and you have to train it, then you have to be the one to put it in it's crate. You have to keep the dog in a small enough crate so it can't wet without sitting in it. You have to keep it in the crate whenever you aren't in the room watching it.

Set yourself a schedule so the dog knows when it'll be going outside. Take him out to potty as soon as you get up in the morning. Praise him when he does. Don't take him in until he does. Then play with him for a while and back to the crate. Take him out to potty after meals. Praise. Play. Back to the crate. Do this at the same time of day every day. Don't play with him inside until he knows to go outside. If he looks like he's going to stoop, scoop him up and take him outside.

He should learn pretty quickly if you stay consistent. Maybe if there are few accidents, your parents will give you more time.

You might want to buy a bottle of enzyme cleaner for those smelly spots. They cost a lot but work real good.

Good luck! Keep us informed on your progress.