Well, there was <<
marvel.fandom.com/wiki/Mother_(Interdimensional_Parasite)_(Earth-TRN287)|an interdimensional parasite>> from Young Avengers that took over parents and began to act like them - not
exactly what you're looking for, but then again what you're looking for is fairly specific.
I also vaguely remember clips of a Chinese sci-fi movie where a child is kidnapped by an evil organization and brainwashed into fighting for them, and particularly into seeing the villainess as her mother. I can't really remember what it was, though (and the victim was definitely underage).
Or, if you don't mind more horrific examples, you have <<
scp-wiki.wikidot.com/scp-597|SCP-597>>, which is uh... essentially, a blob of pink flesh with tits that hypnotizes people into suckling them, and regresses them intellectually into dependent toddlers in the thrall of "The Mother".
What's this from, by the way?