Maybe it's bound to the place of origin? Or they can only reach within a certain distance, OP said their mom nor grandma ever went back to LA, nor Califórnia in general.

Wait wait wait wait. The DEAD or dying?? Your neighbour is playing Frankenstein with random kids!

I wonder how she has the rest of the neighbourhood on her side though...maybe a Stepford Wives type of situation? Stepford Moms, I guess I should say.

Also sounds like they're getting to your mom, regardless of her wanting the full madness package or not. Start cooking your own meals from now on, just in case.

Now that changes things. That would constitute a violation of your personhood and consent, making her a very dangerous, and dare I say, abusive person.

Maybe look into some spells of your own, for protection. At least to grant you the hability to get away from her/her influence safely.

Nah, sounds more like the wife has been casting spells on him ever since they met.

If all it takes for her to keep her looks is OP's hair, and maybe the odd bit of blood, assuming her personality hasn't changed I'd say just sit down and have a talk. I mean, he didn't mention any harm to his health until the spells stopped working, but hiding something for the entirety of a marriage is a big breach of trust.