While waiting our genetic testing on ourselves and our daughter i reserched angelman syndrome and prader willi syndrome as we were given a few different syndromes that our daughter could of had and they were pretty awful syndromes i am sorry your son has them our daughter was diagnoised with the extreme form of smith lemli opitz syndrome and DH and i are carriers sadly our girl is not with us.
I wish i new what else to say other than reserch and find a support group they did wonders for me.