I was totally shocked to read this request. Mostly because I didn't have a clue what to say...there are so many suggestions...then I read Jackie's response!! GO JACKIE! I think she hit the nail on the head, in everything she said. My first inclination, though, is always spiritually based. Then I think logically and try to put the two together. The first spiritually based answer doesn't always work on people who don't play by the rules to start with. (meaning loving them into corrected bahavior doesn't always work, especially if they're a little loo loo :)
There are so many other families that go through the same thing and are never strong enough to say "No! This isn't the way it will work in my home or for my children!!" Jackie's response couldn't have been more perfect. You can love her from afar, but protecting your children from mental anguish is your first responsibility. Stop the cycle with you as the loving, wonderful mother you're trying to be. The bible says to honor thy mother and father, but I know there's a little tid bit about loving and guiding your children as well. This is where you get to decide. Are your children's wellbeings worth honoring her visitations even if she doesn't play by the rules? You've been strong enough to say no to your father's visits (I'm sure that took a TON of courage), now you have to decide whether they suffer from her visitations, too.
Maybe even ask them how they feel about her. Do they have high selfesteems? Do they know she's full of bull and find her "little games" funny, or do they take to heart the poor behavior she's displayed? I've found some very thick-skinned well adjusted young individuals who could never get their feelings hurt by someone they only see 3 days out of the year, even if they call her "Grandma." If you have determined young individuals, you could even get them to "teach" grandma that poor behavior is not acceptable in your home. Not including a sibling in a game or story telling is considered poor behavior, and have your daughter ask to include her brother or refuse to participate. Dont' get me wrong, I can completely see this story going the wrong direction, my daughter would love the individualized attention, too. Especially if she thinks this one-on-one attention is the best, and she would feel elevated to the clouds, and quite especially since there's another young one involved because this sets her apart. So...this will take some pre-planning and teaching your children about grandma's sometimes strange behavior and that it's not acceptable. Obviously you don't want to sabbotage her, but it sounds like she does plenty of that on her own. Also, it will also take you pretending that grandma's behavior means nothing to you (no hurt). Humor me here and try to imagine how this would go...what I mean is that if she behaves poorly, the only response you get to have is a giggle and a kick out the door, much as you would if your child asked for one too many cookies. Do you see now the emotional response would be different. There's not much of an emotional response to too many cookies, just a simple "no" and re-direct of attention. So, you could laugh at her, explain that this is the exact behavior that is not acceptable (as it happens, not later) and ask her to leave. Plain and simple. No questions asked or answered. Also, you need to tell your children that it had absolutely nothing to do with them or anything they've done, just that grannie's a little cookey. If she doesn't have anywhere to go until her flight out, put her in a hotel room. Or better yet, she'll have to get her own hotel room! All assuming that she doesn't live right up the road.
I'm hoping that you've been able to move past most of the hurt your mother has caused you in your childhood, and maybe it only comes back up when you see her treating your children the same. If not, some counceling will do you a great deal of good, just make sure you ask for referrals so you get the best in your area.
The trick is to not allow her to have ANY MORE POWER! She can't do that to you again. You're "a big girl" now, and she only gets at the ones she feels she has power over. If you don't let her have power, she can't have any! It's yours and you don't have to share!! lol
Good luck to you. The holidays are an especially difficult time to implement such a direct and sensitive issue, but good for you for doing what's best for your little beauties! Among many other lessons, your daughter will learn how to be treated and your son will learn how to treat others. These are wonderful lessons, and they aren't the kind you learn in a classroom. You CAN do it! Have faith, take a deep breath, say a prayer, and do what you've been called to do. Your mamasource family is behind you all the way!
Prayers for you and your family. I'll also pray that your mother and father find a better way of treating others and come to realize their mistakes.
M.