Up to two years, the child does not accept the concept of "yours-mine," for two year olds all the toys, balls, shovels and scoops are common. Certainly, cases happen when the children's parents are very jealous of his toys. Once I watched a situation where two moms literally “grappled” for children’s shovel and each of them tried to prove that it is their shovel. They told when and where it was bought and at what price. This was funny and weird to look at. From that day on, I started to sign our toys in order to avoid a similar situation. Well, I taught my son not to take someone else's toy without asking and offering to change his toy to someone else. Now if he wants, for example, to take a ride on someone's bike he comes and offers his bike in return.