Ball Python Won't Eat Unless I Feed Him But I can't Live With Him Right Now... Help?

[MissterDog]

What age did you get the snake at? Are you the only human it's interacted with since a very young age?

I suggest spending time with your parents and the snake at the same time. Having him rest on you for 10 mins, then on one of them for 10, then you, then the other of them, then you, then tank.
Your snake knows your scent specifically. They will react to your pheromones and the chemicals you put out when it's around. While you're with your parents and the snake make sure that you keep yourself in a mind over matter calm or you may spook him. Even the simplest emotions we have can be portrayed in those clouds we put out.

I'm really into snake therapy, and a lot of people might not get it, but... If you're interested I have some ideas (theories really, since we don't know exactly what goes on in their heads).
One way I have helped a snake bond with a human (if only for trust) is actually vocal training by singing to them. Snakes "hear" through vibrations in their skull and skin. Some people who are nervous would probably prefer to hum. During your 10 mins of personal time with each of you, while holding the snake (preferably around your neck unless you're not comfortable), hum or sing a gentle song or your favorite nursery rhyme. The snake might not understand the language, but they are rather smart and do notice patterns, Which music follows. I've noticed that snakes that learn their humans vocal chord vibrations adapt to being calmer around them rather quickly, because nothing else it interacts with does this strange thing.

It's harder to work on this now that you're already out of the house. I think that's why we're all kinda grasping at straws for advice.

Another idea... is if he has bonded to you and your scent and it's their scent that is throwing him off of eating because of lack of trust, the possibility of one of them wearing a shirt of yours with your smell on it while feeding him might help. Maybe a hoodie or something that doesn't get washed every time.

I wish you luck. if you'd like any more ideas feel free to ask.

I think OP would be better focusing on enforcing their basic husbandry first before introducing new bonding theories to the family? I think the key problem at hand is their snake is not eating while in their parent's care. If husbandry is off and there is possible over handling with other stress factors in op's absence, I don't think it really matters how well their ball python has "bonded" with anyone. Be it now or in the future.