Something a little similar happened to some very close friends of our family (fell into unexpected money). It did make their lives and relationships complicated in ways they didn't expect....and part of that was friends and family developing awkwardnesses around them. My Dad, who very rarely gets it right...but when he does he puts it out of the park, just kept talking to them like it had never happened. I don't mean he pretends it didn't, I mean that he congratualted them, told them he was happy for them, that it couldn't happen to a nicer couple of folks, admired the car/house/whatever as you would with any friend, and didn't make a big thing out of it one way or the other. They are immensely special people because of the size of their hearts and the quality of their humor...that what he enjoyed, that's what he still enjoys. He still takes over a sixpack when he visits...cause it's polite, and it's what you DO when you visit people in his part of the world. And while they've never said, I think they're grateful he didn't wierd out one way or the other. They didn't keep a lot of friends in the years that followed their good luck. Dad just never changed, so he stayed.

So, for what it's worth, if it ever happens in my life again....I'm gonna congratulate them and then try to forget that I know about the money. Just keep treating them like the people they always were. Because they would be, just luckier. And if THEY wierd out about what my unstated intentions might be....well, then they're not the people I knew anymore afterall. That's their call.

Good luck with it!