Why is reasonable polygamy wrong? I'm not talking about harems of people, but if 3 people want to engage in a relationship, why shouldn't they be able to?
That said, I do think the government shouldn't really base these sorts of things on relationships or "family values" like we have. Marriage, legally, should be abolished. A household should be made up of independents with their respective dependents, including homeowner(s), and this be the deciding factor for economic stability and benefits. Why a sexual or spiritual relationship based on morality needs to be involved baffles me. All of the independents engage in a partnership or shared assets or separate sub-households with independent assets that may have other extensive financial relationships.
To be more clear, a gay couple may have a child, and live in one of their parents' homes. The parents would be the joint household owners, renting to their independent son and his joint lover, and his dependent son from a former joint relationship. I'm not sure how that's different than what we have now for heterosexuals, but perhaps we need to make it less about relationships and more about households and dependency. I know elderly sisters who have lived together their entire lives, had husbands who have passed away, and they've been raising foster children together. They should be able to share assets and receive benefits like a married couple, regardless of the fact that they're perfectly straight women living in the same household and sharing all of their assets anyway.
Aw, my mom said they've passed away, within months of each other