Technically correct, but most people would assume the duolingo response (i.e introduction: here is my son omar and my husb... etc) I would say (for your sentence): اِبْني هُوَ عُمَر وَزَوْجي هُوَ مَحْمود. By adding the ' هُوَ ', which means he is, you basically say My son, he is Omar and my husband, he is Mahmoud. This is used when like, maybe, pointing out from a list of names, etc.