When my older children are doing independent work, I take that time to do "school" with my 3yo. I do several things with her, such as reading, having her "write" on her dry erase board, playing with blocks or play dough, water play, painting, listening to music, or doing crafts. I have several posts on my blog about some of the things we do. Of course she also listens in on her siblings' schooling, too.:)