Quote Originally Posted by Mpieris View Post
So assuming I have at least a few feet of focal plane to work with, if I focus on the eyes of one parent, the 5 year old and the other parent's eyes will also be in focus I'd they are standing within the focal range?
Correct. Of course, the narrower aperture means more in-focus background, so it's sort of a balancing act. If you can put some physical distance between subjects and background, that will help.