Bob Rueland: I miss Elizabeth. I'll always miss her. But I ache for Grace.
Megan Dayton: "What do you expect most from a relationship? A: Companionship. B: Sex. C: Respect." I'd have to go with B: Sex. But let's mark "C" so we get a higher score.
Megan Dayton: You're going to get a heart, I know. And you'll be able to do all the things you never could before. That's what you've gotta concentrate on. Think of riding a bike, and going to Italy... and dating really handsome men. That, I know, has to happen for one of us.
Grace Briggs: I'm getting a new heart, not a new ass.
Bob Rueland: Elizabeth and I were married by the time we were twenty and we'd been going out since we were fifteen so this may sound a bit juvenile but... can I hold your hand?
Charlie Johnson: ...How many times do I have to tell you? I don't want no brown bananas.
Elizabeth Rueland: Over the years Sydney has become a part of the family. Here he is with my husband. My husband's the one on the right.
Answer: Presumably it's a favorite mascot of the group. There's likely no backstory per se, it's just something the filmmakers did to add to sense that these people have been together for a very long time.