MIL may just have to ask what happens with the names, if I can even get them off. My husband as well as his brother have both asked her to stop doing this, and she won't listen.
The Sharpie issue is not worth a lifetime of grief, no - just wanted to know if anybody had any quick solutions, as I've spent a large part of the day reading books with my daughter.
Her relationship with her kids is has been strained for years on all fronts, and this is a very small part of a much, much larger problem. I try to stay out of it as much as possible and limit my interactions with her. There are some very serious issues, unfortunately, and I leave the dealings with her to my husband and his brother.