When you say mother and son I hope you mean when the son is of the age of reason and not a child.
My point is, aslong as a relationship is between consenting adults I don't really see the problem. I do however have a problem with a person wanting to marry a child because children aren't mentally fully developed and its robbing them of their childhood. Furthermore adults have power over children as many studies have shown that childrens brains are hardwired to listen and go along with what a repstected adult says. Anything in my mind that takes away the right of a child to be a child or doesn't involve consent between adults is wrong.
Whilst distaintful to my mind, I honestly couldn't care if a man has multiple husbands or multiple wives or a woman has multiples wifes or multiple husbands. As long as its all openenly consented too by adults then who am I too stop them?
Of course the issue is, most people that want multiple wives are generally very religious (most poeple seem to only want one partner onces they've found someone suitable anyway). And it becomes very hard I should think to differentiate between women that may be forced into it and those that chose it. Furthermore many of these sects only allow multiple women to marry one man and don't allow it the other way around, which is sexist and inequitable. So unless its going to be equal both ways, I cannot support such a preferentially male driven law.
