I am new here so don't know where exactly to put this question. Hopefully, I will get some helpful suggestions even if I used the wrong sub topic.
Backstory: SIL is from a different country/culture so perhaps something is lost in translation. She has refused to come to our Christmas dinner and family get together this year. By OUR, I mean our in-laws place as they host Christmas dinner every year for the entire family. She had some disagreement with our in-laws and both sides have not talked in a few months.
Our family celebrates Dec. 6th as St. Nicholas Day and grandparents fill boots with nuts and oranges and a small present. Well, they didn't do it this year for her children. I think it was due to the disagreement which is not a big thing but she called me to complain that it was unfair that the children had to "suffer" for the adults issues. Her children are teens but were disappointed so she filled their boots the next day but now the DC are aware of the schism.
I am trying to convince her to come to the family Christmas but she is absolutely refusing. So, her children and the DH will come but she will stay home. She thinks her children shouldn't have to suffer their relationship with the grandparents. Her DH shows her sympathy but he is siding with his parents as he thinks they will NOT compromise on this. I feel very sorry that she will spend Christmas alone as she has no family or friends here.
Is she in the wrong? How do I handle this? By the way, I have broached the topic to the in-laws and they are adamant they are in the right. So we have two stubborn groups here....