My DS is 2yr7m and his nursery school teachers (he is there 2 half days totaling 6 hrs a week) brought up that he doesn't engage with other children as they would expect. They used this and his repeating to suggest an evaluation. I am not sure how children should play with one another at this point but I see him often play with his cousins- for ex, they crash their cars or take turns sliding them down a ramp, they play tag, dances with them, hides under blankets, plays ring around the rosies, they take turns pushing e/o on a ride on car, etc. He will often try to engage his one cousin who is less active to play with him. His cousins are a mix of older/younger/same age.
Recently, DH and I dropped him off together. I was speaking with one teacher and he saw DS trying to organize something with other children. He was telling them which trucks to play with, etc. The teachers did say that what they see may only be because he isn't there as much as the other children who are mostly there 3 or 5 (some full) days.
Isn't this all cooperative play? I am so confused especially because I am also reading that parallel play is normal at his age anyway.