Xw grabbed s11 very roughly and I didn't do anything

[VIDEO: "What is parental alienation?"]

I've been bothered by something that happened after the school Xmas concert back in December. After the concert I was walking through the school lobby with s11, his mother was walking in front of us. I saw xw's grandmother and stopped with s11 to say hi when xw grabbed s11 by the arm in a very rough manner and took him out of the school. The look on s11's face was shocking.
  As I've posted in the past, xw does not talk to any of her extended family ( grandparents, aunts, uncles, cousins) it bothers me I did nothing about it, I didn't call the school principal, I said nothing to xw. Xw does not talk to her grandmother, this should not be put on s11, it should be his choice. I did speak to s11 and asked him if he knew why his mother grabbed him so rough in the school and he said no. I feel he is owed an explication. I call my T and she said I should report it to the school and I spoke to child services and they said it was physical abuse and should be reported. I really don't know what to do.

[bus boy]

I've been bothered by something that happened after the school Xmas concert back in December. After the concert I was walking through the school lobby with s11, his mother was walking in front of us. I saw xw's grandmother and stopped with s11 to say hi when xw grabbed s11 by the arm in a very rough manner and took him out of the school. The look on s11's face was shocking.
  As I've posted in the past, xw does not talk to any of her extended family ( grandparents, aunts, uncles, cousins) it bothers me I did nothing about it, I didn't call the school principal, I said nothing to xw. Xw does not talk to her grandmother, this should not be put on s11, it should be his choice. I did speak to s11 and asked him if he knew why his mother grabbed him so rough in the school and he said no. I feel he is owed an explication. I call my T and she said I should report it to the school and I spoke to child services and they said it was physical abuse and should be reported. I really don't know what to do.

[livednlearned]

I spoke to child services and they said it was physical abuse and should be reported. I really don't know what to do.

What is the nature of the dilemma for you?

[bus boy]

I feel s11 should know his great grandmother, she's a nice lady, she's getting old and I feel it should be his choice. S11 won't talk to my sister, xw doesn't talk to my sister. I want my son to have his own mind to make his own choices on who he talks to. I want to tell s11 that just because his mother doesn't talk to someone doesn't mean he can't. There has also been three abusive situations from xw on me during school events on school board property although she denies they ever happened.

[Turkish]

You can do what you want on your custody time,  apart from mommy.  Remove her from the equation. 

So given 3 (4?) instances of abuse, what stops you from reporting?

[bus boy]

Hi Turkish, I am very leery to report xw because she is a master lier and people believe her, I've brought up many things she has done and she twists it all back on me, denies what she did, will say I wish bus boy will stop these false accusations and move on in his life. She lied so bad in family court, the judge lapped it all up and in his closing statements after court the judge was very harsh in his words to me like I was some kind of a misfit dead beat dad. In xw's eyes if she lies about something she did and court believes her than in her eyes it never happened. Back when we were together, I never heard of BPD or NPD and if I brought up something xw said she would ask me if I had written proof, my brain would do a back flip. She would say if you don't have proof that it never happened.