Seriously getting upset!! My boyfriends 2 year old nephew is purposely bumping, running and shoving…

Seriously getting upset!! My boyfriends 2 year old nephew is purposely bumping, running and shoving into Drew. I get it their kids but his nephew is hella smart he knows exactly what hes doing. Drew is 10 months doesnt know what hes doing. Then after when his mom comes and tells him to stop or he's getting time out he tries to show affection to Drew lol. I just don't like it. From the time Drew was born he's been like this. The day we brought drew home he smacked him in his head and tried to step on him. Ugh I just want to keep my son in the room all day.