My eldest son is divorced from his first wife and is currently living with his fiancée whom he is marrying in October. There have been bitter arguments between my son and his first wife and because, he says, she has been horrible to him he has forbidden me to speak to her. I get on well with my ex-daughter-in-law and believe that I should maintain good relations with her and speak to her if I wish to, particularly if my grandsons are around. My son is now not speaking to me because I have spoken to my ex-daughter-in-law and It is deadlock between him and me.