In the early part of the 1900s, a child made her First Solemn Communion when she was 12. The custom of having an "angel" went away, too, eventually, but I have 5 or 6 pictures of different relatives on this day in their lives.
In this case, John Hesch's oldest daughter Mary was being Communed, and her sister Laura was drafted as her Angel.
BTW, I've never seen a smiling angel in ANY of those pictures. Also, I don't know if boys had Angels on this day...ahem.