She holds out a toy banana. He takes it and pretends to eat. Meg watches Tom struggle to turn over a large plastic barrel, then helps push it. They both fall backward as it turns upright, look at each other and laugh. Ignore conflicts unless someone is about to be hurt or one child always dominates.
Children learn to accommodate each other with practice, sometimes winning, sometimes losing.
Sometimes it's a draw. Even a shy child can learn how to avoid interference. Jenny picked up a smaller ball from the floor and handed it to him. He accepted it and walked away. If it is necessary to separate two children, do so calmly but firmly and suggest another activity to one or both.