You've had the pup for several months? And now is turning down good food for "people" food? yep, that happens! lol
Be tough. No more table scraps. Pancreatitis is scary, expensive and can be deadly. Search on here for stories about it. Use that as your weapon to get the others in the house to comply.
Your pup will eat when he is hungry once he knows the "good stuff" isn't coming.
If the person who feeds him the people food just can't be stopped, point her in the direction of home cooking instructions. That's great too, but she has to do the research. Once she's done the research, she may decide to do it the right way or at least least realize why she shouldn't do it the way she's doing it now.
Good luck!

Welcome to YT!
__________________
The fullness of our heart is expressed in our eyes, in our touch, in what we write, in what we say, in the way we walk, the way we receive, the way we need. -Mother Teresa (
RIP Gizmo 3/9/07-8/18/12)