Cipher17,
Who's marriage is it that behavior going to end? Your brother's and your father's or your father's and his wife's? I reread a couple of times and I wasn't sure. The one thing I do know to the bottom of my heart is that none of this is your responsiblity. If you choose to say nothing or you choose to tell your brother...whatever is going to happen is going to happen.
Kwellings,
My bother and I never saw eye to eye. I am so glad that you have us and your meetings.
Hugs,
JT