iCloud Photo Library merges oldest son and mother over and over no matter how many times I mark her photos as “not this person”

iCloud Photo Library merges oldest son and mother over and over no matter how many times I mark her photos as “not this person”. I have combed through their photos atleast 10 times now and removed her photos and set them as her name instead...everytime I do it, I check the next day and her album is gone and all her pictures are under his name again. Is there a way that I can just reset and start over or something? Manually changing her works and then just reverts back everytime...it’s to the point that I just had to name the album “Carter & Christina”, which I guess works, but I would much rather that they have their own album. Somebody please help!