[nana911]

I vote for the go for a couple hours and then leave telling them your reasons. That way your nieces and nephew get the joy of seeing you and you enjoy seeing them open your presents and you make your point about your furbaby. You will not be enjoying yourself as much as you would without Jamie so there is no sense in making yourself anymore miserable than necessary. Your sister-in-law needs to understand that she did indeed hurt your feelings and she did so unnecessarily. Hopefully, your leaving will make that point without having to state it outright and save further damage to family relationships.

Your not attending will just cause animosity all around. Your attending and staying longer than you want to will just make you bitter. Go with your instincts.