Kath, there may a hereditary link that science has not yet discovered. It may also be coicidence or perhaps an external factor, i.e., environmental. Did your husband and cousin grow up or live in the same area or work in the same industry for example?

But back to your original question about your children. At the moment, I don't think there is a genetic factor other than NF2 that they could test for, which is not applicable since your husband tested negative. Such would be my understanding, but you may wish to talk to your husband's doctor to confirm. Genetics is an ever-evolving field of study.