Just as the title says im looking for a gane with the mother or sister as dom/transforms the mc or at least plays a part in it
Hmmm, I'm actually not sure if they're asking for literal transformation games where MC shapeshifts into a different type of body, or games where a family member changes the MC's personality and helps them become more assertive or more submissive.
Perhaps Sisterly Lust . There's a dom path with the mother, but honestly I can't actually think of many games where a family member plays a huge part in the changing of the main character.
The mother in Milfy City is kind of assertive and wants to bang the MC from the beginning. I'm not sure if I'd call her dom but she is kind of the reason the main character starts to become more confident and begins banging everyone.