My transition from omnivore to vegan has taken decades, and still isn't quite over. I have found that if I have a variety of food which is enjoyable and healthy, I don't fret about all the things I used to enjoy but don't eat anymore.
I'm glad your folks will benefit from the non-vegan food. Hopefully someday your dad will get to liking you vegan food, too! That didn't happen with my parents, sisters, or nephews, but at least they don't give me flak about my wierd (to them, I assume) eating habits.
Peasant (1963-1972) and Fluffy (1970s?-1982- I think of you as 'Ambrose' now)- Your spirits outshone some humans I have known. Be happy forever.