Saving this marriage and their father from this mess IS in their best interest I would think.

Phil McGraw had an infidelity intervention on his show last October and he had a 15 year old daughter there in on it (in the audience). So he at least seems to think 15 is a reasonable age... your kids are OLDER than that.

Your call though... But if your H ends up making this more ugly and they werne't in the loop to confront him when they had a chance to they may be upset wtih you on that.