I think as moms we worry about it and it is always in the back of our minds but our kids worry about it too. Well, I can only speak for mine. Both DDs have shared that concern with me. As I have explained to them though, they have a greater chance of getting essential tremors (something they can visually see and relate to easier) than they do MS. So far there are 4 of us with essential tremors which is a definitely a hereditary condition.

As for the Vit D theory, it is funny how we all think about our childhoods and how much we were out in the sun. I thought about it some more and maybe it is not how much we got but how much our ancestors got. I am 3rd generation born American. My ancestors were from Ireland, Canada, and Czech/Ukraine. Their lack of sunshine could have created a weak link. Kind of goes back to the genomes and epigenomes.