Four-year-old on the verge of being kicked out of his third daycare because of his behavior issues. Help!

We don't know what to do anymore. He's a sweet, affectionate, smart, social kid, but he's always loved rough horseplay. He loves wrestling, tackling, smacking, pulling, scratching, sitting on people, etc. Although i do engage in some wrestling with him, i have very strict no-hitting, no-hitting, no-slapping, no-scratching rules in place. The moment he does any of those things, playtime is over. But he never seems to learn his lesson. He also terrorizes his two-year-old brother the same way.He doesn't do these things out of anger or rage. He always smiles and laughs when he does them.Lately the daycare has been saying that he's getting worse, and is now being openly defiant, looking at them and smiling as he pushes toys off the windowsills, etc.One last bit of info is that he's pretty significantly speech delayed. He only recently started speaking in 3-4 word sentences. No one is sure if he's on the spectrum, but speech seems to be his only issue. Not sure if that has to do with anything, but throwing it out there.Any ideas? via /r/Parenting http://ift.tt/2haRkTT