I have no idea when and how Kevin learned the word mine or it's meaning but boy oh boy he knows it and says it with authority. This has been going on for about 2 weeks now. We live close to the neighborhood park and whenever we go he spends most of his time trying to block the other children from playing on the slides and such all while shouting mine. I have tried to explain(as much as you can to an 18 month old) that the playground is not only his but for all of the children and we all share. Clearly reasoning with a toddler is no easy task. I just worry because I had another mother say to me at the park the other day, "possesive, huh?" I was embaressed but annoyed by her comment as well. I mean he is only 18 months, he's harmless and I am doing my best to teach him better manners. Anyhow anyone else experiencing this? Any suggestions on how to 'fix' this?