I have multiple sclerosis  diagnosed in 1993 when I was 23.Could any siblings also have it ? My sister maintains that she has it , never been diagnosed , self diagnosis which I am not comfortable with . My 2nd cousin got diagnosed  about 29 years ago and thats when she decided that she would have it but I have my doubts , Could she possibly have it , I have never saw her with any symptoms , she has avery fertile imagination and I dont know wher or who to approach regarding this , She lives about 400 miles from me and the rest of the family.