I encourage you all to read this post by a woman with a husband and children with epilepsy.
This is not an "autism" post but a lot of the information (it's a long post but worth it) would be of interest to family members of people with autism.
At one point in time Bil was suspected of having epilepsy but it turned out he (apparently) does not. However, it does seem that the rate of epilepsy in those with autism is higher than that of the general population.
I'll let this powerful blog post speak for itself.