My sister-in-law ruins Christmas?

I think you should try asking your sister in law what, if anything is troubling her and explain why it is you are asking. She isn't exactly being rude to you so give her a chance, maybe there is a reason for her demeanor so just ask her and I hope she confides in you. She may even be aware that you don't really want her there and feels uneasy about it, it can't be easy for her so save some of your Christmas spirit for her. I hope you can try and that you can all have a happy Christmas, good luck.

Pull her aside and talk to her about it. Be nice though. Include her. MAke the best of your situation. Family is number one...but you also have to think about her feelings. MAybe something happened to her around Christmas that gets her down. Dont let her attitude control your environment and how happy everyone else is. Just ask her if everything is ok and that you have noticed she seems down every Christmas. Make an effort too see if she is ok and too see if there is anything you can do to help. Trust m e...everyone should feel better including her and you :)

She probably doesn't enjoy christmas because she is alone. Christmas is a family time. It seems she doesn't have a very welcoming understanding family.

do not enable her unhappiness to electrify the day. Her unhappiness is probably not very own. Christmas time often could contain unhappy suggestions for her. get excitement from the day with everybody and in case you do get a spare mo then in line with risk have a delightful chat along with her to work out in case you could understand why she could act this way at Christmas time. She could welcome the possibility to speak approximately it. Merry Christmas!

Reach out to her, there may be something that your missing. Something that's going on that is really bad in her life.

kick her in the teeth and kill her offspring