I think you’re probably just talking about the ones who were charged... so this isn’t really resppnding to you...
I wouldn’t want them to face jail time or even significant penalty. But I wish there was a mechanism by which any family members who failed to cooperate with the police in the initial investigation would face some sort of consequences for that.
Regardless, I suspect that the entire family needs counseling of some sort... and a means to establish some healthy boundaries.