Sooo since my nephew is gone and my stepdad doesn't have him to pick on or fuss at(my nephew was…

Sooo since my nephew is gone and my stepdad doesn't have him to pick on or fuss at(my nephew was mean af though) but he didn't never have a right to spank him nor grab him up by his arm like he did. He done it one time in front of my sis too smh. Like you don't do that shit. That's his mother's place to put him in his place... but now he's gone he's kinda starting with my son. Like awhile ago my son had his milkshake barely anything was left in it so I let him have it to drink it, I walk out on the porch to talk to my mom. Then I hear "What did you do throw it in the fucking floor?!" I open the door fast cause his tone pissed me the fuck off and my son laying there while my stepdad has him by his arm then he lets him go and walks away when he sees me. Talking about "I was seeing if he still had the cup and I thought you was gonna hit him in the face with the door". Idk if it was really like that or not but just by hearing him saying that to my son in a mean ass tone is not right. And my son was looking down like how he did when my nephew would pick on him. Like I swear I will call the cops on him if he ever hurts my kid in anyway. You shouldn't be grabbing my kid by his arm EVER I don't care what the incident is and you shouldn't be yelling at him or nothing he's not any way related to you!!! I'm his mother and This my baby and I will protect him for as long as I live. And your ass will be in jail if I ever see anything. I told my mom I'll call the cops on him. She's like "He's had a nervous breakdown" and blah blah. I don't give a fuck what he has or hasn't he ain't gonna treat my baby like he done my nephew or how he treated my brother... Like last night my son was throwing a tantrum and my mom was trying to pick him up and he started kicking her. My stepdad yells "Hey!!!" In a mean tone and when my mom picks him up he's like "yeah pick him up don't teach him nothing. Don't teach him that he should know not to do that". Like shut the fuck up already!!! He's 2. Fucking TWO YEARS OLD. He's gonna throw tantrums, hit, kick that's what they do. They don't know how to express themselves you fucking idiot!!!. I don't plan on living here much longer. If only someone would call me back for a job me and my son will be gone. This is why my 20 year old brother has anxiety now cause he done this same shit to him when he was little and it's fucked him up emotionally. And why none of my other brothers or sis or even me like him. He ain't no damn grandpa to my baby. I don't like him one bit. Even my brother told me before he left to go to college, "Don't let your baby grow up around him".