In all seriousness, this is a good moment for the parents to have a conversation about how knowing what is right and wrong is not based in an institution (like the church), but in ourselves. The church doesn't have an exclusive on morality.

If the pastor's scandal is dominating the church's conversations right now, it is human but maaaybe they could try to move on from that? Unless this is taking the form of a broader examination of assumptions about the role of the church, it sounds both corrosive and prurient.

Finally, parents should know what is going on in youth group! Always! If the youth group leaders aren't open to giving a full account of the conversations there, take a break.