I get how you feel about frustrating parents. My dad had a heart attack over a decade ago, and experienced frequent angina… I weedled and discussed and suggested keto over and over and over. Finally I resorted to me and mom ganging up on him (mom is also keto) and saying we were worried about his health, and I bribed him. 6 months on keto, and he gets money. No cheating allowed, no beer, no bread, full on keto.
3 months in and he started losing weight again… his angina is gone… less hungry. I don’t know if he’ll continue past the six months but now he’s had a taste of what keto can do and can’t refute that it works.
His dad and mom also went paleo, so reverting back to his sugar and bread fueled existence would cause his dad to be disappointed I’m sure. Difficult for anyone to face, I’m sure.
You can lead a horse to water, and bribe him to drink, but it’s still on the horse on whether he’ll stick around.