Read all you want to know about MS and genetics at the MS society webpage. One brochure is here. You can use the search function at that site and get lots of info.

Most MS researchers feel that genetics affects the "susceptibility" of a person for developing MS, probably due to immune system characteristics. In the US a person has ~ 1 in 750 chance of getting MS. Relatives of a person with MS have ~ 1 in 100 chance.

I think these odss are similar to my odds of having twins. Since my gggrandmother had fraternal twins, my odds were 1 in 100 ---- and I had twins!!!!!!!

These days MS is easier to diagnose than it was 20 years ago. With a good doctor and awareness you can stay on top of the situation. But as many doctors know (and I fully understand because I've witnessed it myself in my personal observations about my own physical symptoms) it's easy to read about a syptom and then see it in yourself. Objectivity is extremely difficult. But IMO not having a vent for your thoughts, feelings and fears is worse. Some people (me for example) just need to talk more.

Knowledge is power.