Woohoo :) My parents were instructed not to tell me. When I found out they told me not to tell anyone. I could've told my grandpa that I "wasn't his", but I didn't. He shortly died of an illness thereafter. So I think it wouldn't have been good timing.

I would say that it's important to not make it into a big deal. I think it's cool and I am grateful they spent the money and went through the extra pain of conceiving that way. There's no need for drama and tears :)