Call it a buddy system. Call it free babysitting. Call it nanny training for chipper teenagers. The practice is the same: Assign the smaller kids to the older kids for basic stuff like tooth-brushing and shoe tying.
Photo Credits: BBC; Guy D'Alema, Freeform; Michael Yarish/Getty Images; Take Five, Hulu; Jackson Lee Davis/AMC; Virginia Sherwood/NBC/Warner Brothers; Noam Galai/Getty Images for New York Comic; ABC; Koury Angelo; Amazon; Quantrell Colbert, Quantrell Colbert/The CW; Rich Fury/Getty Images