My son is organising my grandson’s christening, and it will be the first time I have been in the same room as my ex and his new wife and family after 7 years! I divorced him four years ago for adultery and it was a very acrimonious one. He has continued to cause me problems even since his recent marriage. Has anyone any strategies for how to cope with this very difficult situation? I don’t want to spoil the day for my son and his girlfriend.