And that, Dag, is exactly why ONE spouse as primary custodian must and will remain who is legally recognized. The gov't already has rather simple standards for qualifying to marry. The point being to protect individuals from coercion and redundancy. Quantity of spouses is a lifestyle choice, one's gender and sexual orientation is not. Most people have several exponential next of kin. The point of marriage is to have ONE person have the custody and primacy of responsibility to their spouse. Otherwise, there isn't much point in having marriage if a boatload of people can make a claim on you and all you own too.