I will never understand why some kids are sooo mean to others!

I have been sick all day

and have not done much other than read so I felt it was best to just stay home tonight instead of going out with the kids. Sean and Jonah took the little ones to our church tonight where they were having "trunk or treat" as well as games, hay rides, and hot dogs. They needed some extra help so Sean helped with the fishing game and Jonah managed the little kids.
Jonah took the kids on the hay ride. Dani wanted to sit up front with some of her friends so he said ok and sat with Robert near the back just in case he decided it was time to get off. One of the boys on the hay ride happened to be one of Sean's half brothers from his dad. I think he is in 7th or 8th grade. (I think I have told you Sean's dad has nothing to do with him by his bio-dad's choice). Anyway M decided it would be fun to tell Dani that Sean was not her brother because they do not have the same Daddy. My little girl became hysterical. She loves her Bubba!!! Jonah overheard this and heard Dani start to cry. He got Dani with him and Robert and got her calm. He texted me and told me what was happening and found Sean. He and Sean went and found the Awana directors to handle the problem. They wanted to find my uncle who is the Pastor, but he was with someone.
My little girl is still upset, but she has been assured that Sean will always be her brother and that M was just trying to be mean to her! You don't know how bad I want to call Sean's bio-dad right now and give him a piece of my mind! I am letting the Awana leader handle it though!