What would you do in this uncomfortable situation?

I think she was crying for that long because she wanted to be comforted by her nommy and not grandpa and for everyone to just sit around and not interfer with getting that child comforted to go to sleep is just beyond me. I am a parent who believes in CIO, but as a last resort. If you've tried everything under the sun then that is when you CIO. He is old school and that also seems like what he did when he had kids. IDK much about the situation, but you can't teach an old dog new tricks.