What rights do parents have to visit their adult son who is brain dead and in the care of their daughter-in-law?

By law the wife has the right to set presidence over visitation rights to your adult son who is brain dread. However, it would be cruel of her not to let you see your son anytime you so choose. It is important that you do not get into arguments as to whether your son should be kept mechanically alive or off life support and that is solely her decision so don't make waves; visit your son and be kind to your daughter-in-law as she is hurting just as much as you are. If in doubt ask what your son would want as far as you getting along with his wife.