I agree with everyone else, I just wanted to say that I think you have a heart of gold for putting so much thought and consideration into everyone else's feelings. That's a situation that would stress me out, and I think you're handling it so well. I'm sure that will shine through when they meet you, and I bet they'll love you.
I'm with everyone else. Meeting them for the first time and staying at their house is too much, too soon (for everyone involved.) I would get a hotel room.