Hello, Mrhhome, you sound like a terrific person and no way did you do anything wrong, you in fact did everything exactly RIGHT.
JW's are all about consequences. For non-dubs, that is! They think what they are going to get is "fruitage" and all the "worldly" people will get Consequences.
But you gave your wife's brother a clear look at the natural and deserved consequence of his actions. And that is all good!