I recently realise that there’s a lot of confusion around sharing toys. Forcing to share toys does not teach kids generosity, but rather to be protective of their own things. From an early age, we taught Oliver and Emily to take turns: if one is using a toy, the other waits; this also promotes respect for the work (play) of others. As in a Montessori school where there is only one material of each kind, we don’t buy double books and toys. This doesn’t happen overnight: at the beginning I was more involved in their games to make sure turns and concentration were respected. It's a long process, but it makes a big difference.