Neighbour at no.4 has been disqualified from driving for 2 years for drink driving. Talking with friend at no.3 her DH thinks that he should tell the ExDH of no.4 as they share custody of 2DC. Me & no.3 have told her DH we don’t think it’s his place to get involved but he’s determined to tell him when they’re meeting this Saturday. His rationale is that if she drives whilst banned with their DC in the car he becomes involved (but we’ve no reason to suspect that she will do that). Should he tell her ex or stay out of it?