Khrysse - have your FIL look into a Gluten-Free Diet; many people with MG have found that some of their symptoms are lessened when they eliminate gluten (wheat, barley, and rye) from their diet. Be warned, though - there is no such thing as "a little gluten"; a GFD means NO gluten whatsoever. (He may want to get tested for Celiac Disease before he tries it - a positive CD diagnosis means he will need to be on a GFD for life; a negative diagnosis doesn't necessarily rule out CD/gluten sensitivity, however)

Thankfully, the Gluten Intolerance Groups and Celiac Disease Organizations have done a fantastic job of educating doctors, food manufacturers, and restaurants about how common gluten intolerance is, and there are more and more items coming on the market every day that are gluten-free. It isn't as hard as many make it out to be (our youngest daughter was diagnosed with Celiac Disease 2 years before my MG diagnosis, so I was already on a GFD), and many people actually find that they feel so good on a GFD that they have no problem staying on it.