My boyfriend's ex-wife (divorced a year) has been talking to the kids 10,12 and 14 about the divorce, about infidelity and details (lies) about my boyfriend, which is seriously hindering the relationship between him and the kids. We are looking for some sort of solution to get her to not speak to the kids about those items that are hindering the relationships. I have suggested a siest and decist letter. Would this work? If not, what are his options?