Point of order, they are not married to the same man.
They are pretending to be. Only one of them legally is, though.
The rest are just concubines with no civil, legal, or moral protections.
I expect they could pay a lawyer to have pretty much the same rights as if they were all married. As others have said, if they are not taking from the government and supporting themselves it does not bother me either. The criminal polygamists are the ones taking underage girls and gaming the welfare system. Polygamy was made illegal as a political act against the Mormons, not for any moral reasons and no matter what the historical results were.
They look happy now, may they all grow old together and stay that way. Personally I’d say you need either 1, 2 or 4 or more, 3 is the wrong number. Joe needs another wife, lol.