Grandma, dad, mom and a little brother stand side by side in big, clean outlines, with a number printed on each piece of clothing and a name label under each person. The key at the top pairs 1 with red, 2 with blue, 3 with yellow and 4 with green.
The key is written as words, not color swatches, so a child has to read red, blue, yellow and green before the crayon moves. That makes it a quiet reading page dressed up as coloring, and the name labels underneath give the family words one more pass. It prints in black and white, so it costs almost nothing in ink for a whole class.