Aw ladies , sending you a hug. I expect your brother and wife had a really tough time telling you.
My best mate had a MMC at 12 weeks three years ago, and has been TTC ever since with no luck bless her.
I had already three lovely kids and then tried for one last one. I got preg, waited to tell her, never seemed to be the right time as I knew she would put on a brave face and then cry herself to bits after she went home. Finally braved it, she said she didnt get upset, but hey who wouldn't (been there), I felt terrible. I then sadly lost baby at 11 weeks MMC, she was there for me as I was for hers.
So almost straight after I lost, I was lucky enougth to fall preg again, I couldn't imagine how to tell her again a second time, I was the worst thing I had to do ever..
Your brothers due date - maybee in a strange way it was meant to be, as yours had not been able to continue, a sort of karma perhaps, maybee that's a easier way to look at it, keeping the special date in the family.
XX