To alleviate your child's anxiety over sharing, have him put away his favorite toys before his friends arrive to play. This shows your children that you respect their special things, but that sharing is part of playing. I also like to let them know that their toys won't be going home with their friends. If your child and his pal start battling over a toy, calmly tell them. "We take turns in this house." Then set the kitchen timer to ensure each child gets equal playtime with the treasured toy.