Sometimes EPI treatment can get a bit tricky. I had my girl on PancrePlus tabs for over a year, then switched to powder (more than 4x the cost, might I add) and everything went straight to heck. I / we toughed it out on the powder for two weeks - she started getting up 3-5x a night, alternating constipation and diarrhea, etc.; finally I said ENOUGH and begged our old vet to send us one more bottle of PancrePlus (despite the fact that we'd started with a new vet). He was kind enough to do so but the symptoms still haven't resolved - blood in the stool for ten days now, free from parasites per lab, still getting up multiple times a night.
All that to say that you are not alone and sometimes these things are not so simple, and I feel horrible for everyone involved - your dog, you, your parents, everyone.
If Sampson is on steroids and enzymes, it sounds like there are maybe two conditions (EPI and colitis, perhaps??), which further complicates things. How much have you experimented with his diet? Even though he is getting enzymes, he could have a hard time digesting a certain macronutrient. For example, my gal has trouble digesting fats, so I feed her a low-fat food and she never gets peanut butter, cheese, beef, fatty cuts of chicken, etc. Maybe there is something like that at play?
Also, you said:
Right now he has runny unformed poop, he eats his poop, has a very strong appetite, when off his steroids he has a gurgly stomach and is gasy, he has recently pooped wide in the house and that's what has sent my parents over the edge
How long is he left alone to "hold it?" Have you modified his feeding times to make this easier on him? As I'm sure you yourself have experienced at some point, it's no easy task to hold watery diarrhea, even for us humans. I know it can be frustrating for your parents to clean up EPI poo, but maybe it's worth a try to change his feeding times or restrict him to the kitchen/bathroom/other easy-to-clean room when unattended. Of course I'm sure there is more to the background; I doubt any vet would agree to euthanize a healthy animal who was just having accidents in the house, but wanted to make sure you all had considered those possibilities.