update:
talked to one parent when she met up with us at outing. We are ok. a little off but ok. we do not agree on what happened or how it was dealt with or should have been dealt with. the uncle told the mother that they were plying when he came (my daughter and their son) which was so untrue. LOL what does that matter anyways? She said that she trusts the way I deal with her sons behavior so she didn't understand why he had to go home. She understands that I cannot wait until there is a more serious occurrence to set a precedent. She agreed at least that she cant fully grasp my reaction because she didn't see how it all went down

The other parent pulled her child. He wont be back. she said she doesn't feel comfortable anymore. fair enough I guess.