My mother-in-law has never treated me like one of the family. She very often does not include me in a family event, and she treats my children (her son’s children!) the same way.
My husband thinks I should just put up with all this and not let it bother me, but Queenie, how much can I be expected to take before I just walk away?—Offended daughter-in-law
It is up to your husband to make it clear to his mother that you and your children are part of the family and should be treated as such. Things will stay the same until he does so.
Until then, have as little contact with your mother-in-law as possible and when you do see her treat her with respect, as difficult as you may find it.