Sosocofused, I posted on another forum that your brother has effectively silenced you to (witness in the family) and witnesses. He now has control over what they hear of your "condition".
Personally, I would get him out of the business immediately and I say not even wait for a two weeks notice, he's fired. (Or he quit, then get out of here). Disloyalty to an employer is not something to play around with.
I've been through a similar situation after my dad died, with a fleshly brother that wanted the business and me out. But I had been there much longer than his few months, I had more stock, etc. So he started the character assasination machine going on in the congregation and the family. He was creative in making up lies, it was ridiculous, but effective. Interesting, witnesses play dirty, and use their speech to slander whoever, they will steal out the back door, slander you to customers and clients, and then slander you to your family of how bad you are. Witnesses eager to hear the gossip will believe anything without supporting evidence.
Donald Trump won this law suit: http://news.yahoo.com/blogs/news/former-beauty-queen-ordered-pay-donald-trump-5million-184353363.html