Well, your "big boy" doesn't mind because he knows about the beauty of photography (see first picture) and the little boys STILL don't mind... this may well change in the future, so capture as many lovely moments NOW as you can. (Though they are boys... seems like the GIRLS get soooooo self-conscious by the time they are 11 or 12...).
Lovely to see your family. I enjoy each and every photo of the three.
And your "big boy" IS handsome!!!