I have a 20 month old in my care for 4 months now. He's an only child, no young cousins his age, has not had much interaction with other kids until he started coming here. His daily routine is to have a collection of toys on the couch, he'll put them there, one at a time until he's satisfied, then proceed to play with one or two. If any other child comes even close to playing with one of "his" toys, he immediately starts to cry and scream in terror. If someone goes to play with a toy that he just left, again, crying and screaming. He doesn't get the concept of sharing. He and only he can be looking at a book. I explain to him: you can BOTH look at the book at the same time, crying and screaming....again. This morning, the 3yr old DCB was drinking from the cup the 20 month old was drinking from yesterday, he freaks out, crying screaming......ugh! This has been going on for weeks, I don't know what else to do. I've explained to him, they're not your toys, you have to share/take turns, that's not the way we behave etc, etc....I've put him in time outs, tried on the couch, and in a playpen away from the others. The negative behaviour is just getting worse. He can't wait 2 seconds for anything. Sees me with the snack, immediately starts crying and screaming, because he hasn't got it yet......it makes for a frustrating day, dealing with all the crying and screaming....any suggestions?