The inheritance is recessive because generations are skipped and because the sick children have healthy parents. It can be autosomal because the children of a diseased and a normal parent are carriers. They will thus have a bad gene from the ill parent and a good gene from the healthy. There may also be that it is x-linked because an affected father not disclose his illness to his son. Boys always get their single X chromosome from their mother and thus can not inherit his father’s bad gene.
