You're not keeping up. Ironbear24 posted about his intention to beat up a family member prior to the assault, and then described it afterwards. There's no doubt of his guilt. And it's guilt of the worst kind, since it was a premeditated assault.
Personally, I'd encourage the family member to press charges.
Problem is, his family member agreed to fight against better knowledge. As such there should be little to no claim of premeditated assault. However if there had been an injury of any kind I would not want to be Ironbear.