If polygamy was legal, how do you think the marriage would work from a legal standpoint?

For instance, would the law be that everyone would have to sign the marriage certificate? Let’s say a man and woman marry, and then they want to add an additional spouse, would the first two both be married to the third?

If one dies, do the other two continue to be married? If there was one main bread winner, and he/she dies, do both other spouses get equal portions under the law of his estate? In other words, the original spouse who does not earn an income, when she allows another non-working spouse into the marriage her own inheritance was just cut in half.

What if one decides to get a divorce? How would the alimony or child support work? Does everyone have to sign off on the divorce?

Could the marriage be for an unlimited amount of spouses being added?

Please add any other thoughts.