K.H.
Hi W..
Your intentions are very good. Unfortunately, not everyone is going to see the world as we do. And, we won't always understand why they just don't do things the right way - our way.
It's clear your feelings are hurt and you're trying to do the right thing under the guise of it's best for the family...However, you may want to review the Serenity Prayer and recognize this is not a situation within your control...'Want to keep peace? 'Want to be the 'bigger person'? I'd say -- let everyone do what -they- want to do and stop judging them for it. It won't be easy at first. Some of the most selfless decisions aren't...
But, once you have decided to let go of controling your brother's life and trust the decisions he makes for himself and his family, the quicker you can focus on doing special things for and with your core family group. When you're happy, your immediate family will be happier too.
Support your brother if he asks for it. Otherwise, let him make (what you think) are his own mistakes.
Good luck. And, I sincerely hope you have a wonderful Thanksgiving, W.. :)