Dear Didier
Take a deep breath!
You know that old saying "You can choose your friends but not your relatives?" I think that this is a perfect example.
Don`t be embarrassed, you have been a wonderful giving son to your parents and will NEVER have to say "I wish I had or I should have done".
Your brother sounds like a real winner.... were it me I probably WOULD have smacked him! You did really well not to.
Give your Mum a big kiss for her birthday, she is lucky to have you.

Take Care
Marica
If you can`t vent to your friends, well who???