I did a search in the forum and I am surprised that I did not find anything on this topic. My wife and I are atheists, and my parent, siblings and their families are Catholic. Now that I am married and have a child the lines with religion involving my family need to be more clear, it was a little different when it was just myself. Next weekend is my niece's first communion and of course they want to make a huge deal and celebrate this act of cannibalism. We won't be attending the service, but I feel like we kind of have to go to the party afterward. The questions are... should we go? Should we bring a present? What kind of present should it be? And many other questions I can not think of.
My son is too young to realize anything but we have two more of these in the coming years as well as many other religious family events. We need to figure out how to approach these things.