DSib has fallen out with DPs. This has happened before and it showed DSib to be quite petty and nasty and my DPs were hurt by their behaviour. (DPs are kind and supportive - no issues there. DSib would probably agree with that on the whole I think.) I try not to get involved and make things worse and so try and remain civil and stay in contact but it does make me rethink my relationship with DSib as I see them in a different light now. Has anyone been in a similar position and what did you do?