A grammatical thing I've been wondering about for a while that maybe people can help me with. It's not of great importance, it's just something that been niggling for a while now.
If you were at the wedding of Mary and John, and you wanted to, say, pop some photos of the day up on Facebook, would you entitle the album 'Mary's and John's Wedding' or 'Mary and John's wedding'. I used to always go with the former. But I then started to doubt myself on it because pretty much everyone I know seems to go with the latter. So I've started going with that. It just seems like the latter way is treating them like a compound!

Can anyone shed light on it for me? I've tried to search Google but don't seem to be phrasing it correctly to find the answer. I'm sure it has been discussed online in many places, I just can't find those places.

Mods, was not sure where to put this so feel free to move it if there is somewhere better suited.