@neologist,
Hm, I can agree somewhat to this, neologist. Usually though, close relatives are already protected legally. For instance, if the father is ill and cannot function on it's own, the son is legally the next keen and is allowed to make decisions for his father, also health decisions.
Now if the father has a partner whom he's not married to, legally the partner has no rights whatsoever, even though he might be the only one caring for the father and helping him. Legally he has no stand, neither does he if the father dies.
There are so many legal decisions one is left out from when it's a same sex union. There was this case in Ohio (somewhere there is a youtube video of it) where the family was against their son being gay. He left his family home to live with his gay partner for 7 years in Florida. When he was ill and dying, the family took over and shut out the lover completely. He wasn't even allowed to attend the funeral. How disheartening was that?