MS is not directly inherited, but genetics play an important role
in who gets
the disease. While
the risk of developing MS
in the general population is 1/750, the risk rises to 1/40 in anyone who has a close relative (parent, sibling, child) with the disease."
http://www.nationalmssociety.org/about-multiple-sclerosis/what-we-know-about-ms/who-gets-ms/index.