Mercury chelation may help him, but first he would have to remove any Amalgam fillings if he has them. I would strongly suggest Cutler Protocol, and look into the Yahoo group that I'll link to below. Many of the other forms of chelation can be quite dangerous.
A friend of mine has been diagnosed with MS, and I did a query on the Frequent Dose Chelation group concerning. I got some outstanding responses from some other individuals with MS. Here's the link. You or your brother would have to join, but I would suggest doing so in any case.