I don't recall any perfectly fitting games to answer your request. Sure, you can just check the games with tags "trainer+incest."
https://f95zone.to/sam/latest_alpha/#/cat=games/page=1/tags=30,199/sort=rating
Or "male protagonist+incest+mind control"
https://f95zone.to/sam/latest_alpha/#/cat=games/page=1/tags=30,111,173/sort=rating
As you can see, there's, for example,
Four Elements Trainer in both lists. There, you can impost Azula's brother and "train" her. Theoretically, that's similar to what you want. But the plot is a bit bland, and the writing is a bit lackluster, alas.
Restore Her Career is somewhat popular, but it has the problem.
I like
Hunter's Harem (both mom and sis), if anything, but it's real-porn-based, and a lil bit too fast-paced in this regard.
And so on.
Anyway, there're properly fitting comics.
About mother. Literally kinda guide to train a mom.
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About mother and sis. Kinda groundhog day with a task from an evil god to train MC's mom and sis.
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