Mike,

I wanted to throw another thought out there concerning your family getting MG. It is a possibility that your family has been exposed to hazardous waste. There are neighborhoods built on or near old chemical dumping locations. Some of these chemicals are known to cause autoimmune disorders (or at least increase your chances of getting one). You can look up known locations for polluted sites using the following website.

http://www.epa.gov/emefdata/em4ef.home

This may be a crazy idea, but I wanted to share this with you just in case it is helpful.