I certainly don’t have any inside information but my guess is that he will not show his face there at any time unless he is forced to for some reason, perhaps about the settlement of his father‘s estate (which could be done in an attorney’s office). The trial may even be the first time he heard how KB was treated by both his mother and sister, since he didn’t know KB.
I know he rolled his eyes and looked disgusted at PF on leaving the courtroom and I’m sure part of that had to do with the disgust of knowing what his brother did, but I feel he knows PF has made his Own professional life difficult, too.
JMO