I have done so, in a series of children's stories I have since published. Back in the fifth grade, learning, growing children had less diversions to occupy their after-school, hours. If memory serves, reading, and being read to, played an important role in a child's life. Grandparents can rise to the occasion, however, and give their grandchildren the joy of reading for life. Of course you can factor in the reading of software documentation or the complex computer-game manuals.
Most kids understand the latter better than their parents.
I stumbled onto such a program while doing research for an article. The local branches of the San Diego Public Library have a Saturday morning session aimed at youngsters from sixth through ninth grade. As the kids get involved, they become eager to read out loud to their group. To go a step further, volunteer high school students join in and read to younger kids. The older children have fun dramatizing the stories and urge the little ones to do the same.