I’ve spent 90 minutes reading thread 1 and the this. Wow!! This is some class A exclusion BS!
Putting the private school/inheritance to one side for now. Which again is BS.
Your Eldest and Youngest daughters are SISTERS! Of course they would want to be flower girls together for their Uncle and Aunty’s big day! With matching hair styles, and matching dresses, and playing, and dancing together.
I think you are giving your BiL and SiL too much credit saying they didn’t know. They knew they were excluding your eldest daughter, and they did it intentionally. And if you all do end up going to the wedding your Eldest will be excluded from the family photo, at the very least.
I find this entire situation entirely unforgivable. A girl knowing her worth in this world is difficult enough, without her own family (that she LIVES WITH) implying she “isn’t worthy”.
Your husband, her step dad, should be absolutely outraged. Not this seemingly passive “don’t want to rock the boat” BS attitude.
Your MiL asking for time with your youngest without your eldest there. She should want to spend time with them both together and both individually. Because, biologically or not, she is a grandparent to your eldest daughter. And that is because her Son is married to you.
The rage I feel for you is unreal. I would decline to attend with your eldest and do something else. I would want to protect her from other exclusion tactics on the day. Go to your brothers and sleep on the sofa bed in the kitchen. Your Husband and youngest can go on their own.
Honestly!!! People are really unkind to each other.