I have been divorced for 10yrs from ex who i now realise was a bitter and manipulative person. He lives overseas and doesnt see DS and DD often. They are both adults and very different people but i have always encouraged sibling bond as feel its important as they get older. It has come to my attention that ex has been speaking to each of them about the other, things like "you are my favourite, other only contacts me when wants something" etc etc. And repeating any disparaging remarks one might have said about the other. Kids don't see through the manipulation like I can. No idea why he does this. Current DH says I should ignore it and not get involved as wont win, but I feel he is driving a wedge between a sibling relationship. Should i take DH,'s advice, tell ex I know his game (don't really have contact and not that keen to strike it up) or tell the kids they are being played?