Said occasions are meant for certain people......mother's and father's day....Your child should be with respective parent....if not then you are definitely alienating said parent. I promise this is not healthy for said child you are claiming to be protecting!!!!!!!!!!!!!!!!!! Maybe you should rethink what you are doing. And I could go on, but I won't right now. But the future holds justice and you better hope your justice prevails for being unfair. Anything less than this is going to cause your children future issues. There is no point in this other than you are trying to make a point and you should of thought what you children thought and did you bother to tell them it was mother's day and who they'd like to spend it with? Karma sucks if you were wrong! My ex's and myself didn't always do right....but I honored their fathers and worked on raising healthy well being children....that was my goal, no matter my feelings towards the other.

I'm not very happy right now with the parents who are being selfish and trying to push someone else into that place, I was raised that way and it just doesn't work, You cannot convince the kids that someone else might just do....They have to have that other parent to know life. And the other parent isn't replaceable...ask that 48 year that had to walk to her parents grave if that made life better.....and then ask if they have questions about their life and who they are, you better be able to answer all the questions and you won't ...in the end...the resentment will be for you, because you thought you and your genes could give it all...but you can't.
Your children will only trust you if you truly respect the person you made them with, so give them that much, at least.. Tell them who they are...let them form their own opinions of their other parent without your say so, you won't lose nothing in this...but you will truly lose everything if you do everything you can to prevent it.