Yeah, but your ability to be treated as family is heavily dependent on other people.

I think a lot of people would say the way they treat their family and friends is independent of the way they themselves are treated. For instance I have a friend who is a recovering heroin addict. He did a great many things that he now regrets and I even got in a physical fight with him once while he was high. There's been plenty of times in our friendship over the years that he has wronged myself and others I care about but I forgive him and treat him as I would a loved one regardless. That's what friends are for. I consider him family whether he feels the same or not.

If they don't, you just have an unhealthy lack of boundaries in relationships.

I'll try not to take this personally. I don't invade other people's personal space just by caring about them. I'm not a stalker or some kind of deviant that thinks he has a relationship with someone he doesn't. Caring about other people's well being, treating them well, and helping them when you can is only unhealthy if you can't sustain it (ie giving away all your money and getting evicted because you were helping a friend).