Any registered domestic partners still out there?

I am becoming the primary care giver for mine, and would love to chat about how medicare is really paying and or categorized our family status....what kinds of estate issues have come up...etc. does it go according to the regular estate rules or do we need some specific documents that im not aware of? We have advanced directives and power of attorney and poa for healthcare...im curious to hear other experience and make some connections. My partner is a great guy..he is starting to have significant health issues and I want to make sure this younger generation of medical people understand that I am his legal spouse, and vice versa. Seems like the history of the domestic partner law has faded to distant memory...and while I advocated for it with my former partner, as times have changed, for a lot of folks, we still, to my understanding, cant get married, as we are both on social security and would take a huge hit on income. Also it will mess up his divorce settlement/retirement package if we did, and neither of us wants to do that. He is on good terms with his ex and she is a nice lady. We have spent holidays together, with his kids. Any experience?