One of my nieces is almost 11; her parents are separated and my sister has a 5 and 2 year old with her now husband. We spent yesterday with them and DN mentioned several times both to my DC and her siblings how she gets double the presents everyone else does because she gets some at her dad's house too. She said this in a particularly boastful and goady way to her sisters and repeated it to my DC even after I asked her to stop because my DCs father chooses not to have contact and it isn't kind to keep reminding them of that. My sister said she's at a loss of how to deal with it as it comes up every Christmas and birthday and is going to affect her siblings increasingly as they get older each year. She said she was tempted to get her less presents with the reasoning that she's getting the same amount again at her dad's but she couldn't bring herself to do it. How would/do you deal with this?