Why would you invite a 12 year old to an adult birthday party and then get mad at her for acting out? There's a lot of unresolved issues here, perhaps addressing those as a family would have been more appropriate than trying to act like a kid.
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Blended family dynamics can be tricky, especially when stepchildren challenge boundaries or express frustration. Going through stepparenting conflicts, managing birthday or family gatherings, and understanding preteen behavior are common challenges many families face today.
Why would you invite a 12 year old to an adult birthday party and then get mad at her for acting out? There's a lot of unresolved issues here, perhaps addressing those as a family would have been more appropriate than trying to act like a kid.