Instead of numbers write the color word on the bottles. Sort pom-poms by color. Empty each bottle and count the pom-poms. Then record how many pom-poms were in each bottle. Add the two colors together for addition practice.
I like this as a way of displaying family pictures too! If you still wanted to do the traditional family tree, you could always use this idea for displaying pictures taken in the classroom and pictures with friends - their "classroom family"