As an unofficial blended family, we are trying to find our traditions. Its not always easy to establish figure out the traditions when the kids spend every other holiday with the other parent. Plus you have to combine the traditions of two different families.
This is not always easy.
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Just in case you think this is all one way...at the first of December the Ex-Wife/Friend's mom (who lives out of town) comes and visits for 2 weeks. During that time The BF is flexible with parent time, allowing the kids to spend lots of time with their grandma. When its "our Christmas" we let the gets go to the Christmas Eve service with Ex-Wife/Friend and instead of them spending time with her early in the day (like we do) on Christmas she takes them in the afternoon for a big family party at her dad's.
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Our goal is to create a happy day without stress. I think it's about being flexible and respecting each others traditions. After all its not about you and your ego its about the kids, compromise is key. I know it's not always possible for this to happen. It takes every person putting their ego aside and figuring out, I know I also lucked out by being friends with the Ex-Wife/Friend first then hooking up with The BF.
I love when I start sounding like I know what I am talking about.