I never really understood the lyrics to that song, so I don't personally think you really meant the song to play such the role as everyone is giving it. (correct me if I'm wrong, though.)
However, back to the picture. Being who I am, coming from what I do, I get FAMILY from that shot. Yes, all the pictures overlap, which probably is the 'Come Together' title (clever, btw), but when I see it, I see the young and old, married and not, but still with kids. Together, either way. Family, either way. Siblings, spouses, family.
Yeah, I know ... three clicks left of center ...