@Playingdevilsadvocate
My SIL has gone NC with her DF. It’s been a couple of years now. He’s just died. I don’t know what she plans to do regards funeral yet but I feel that if she didn’t want anything to do with him in these last years of his life, she can’t go wailing at his funeral with his grieving family. They all know how she’s behaved towards him and they don’t want a bar of her. She should have thought of this moment before she cut him off! Should his widow (not her dm) have to encounter this person who caused her dh so much pain, at his funeral where she will be grieving her dh? Thoughts?
There's a lot said in your two posts, OP, that I have to wonder about.
"she can’t go wailing at his funeral with his grieving family."
Would she be wailing?
Are his family grieving? Or glad to see the back of him because they had been unable to go NC with him too and his death releases them?
"They all know how she’s behaved towards him and they don’t want a bar of her."
How do you know what they think and how they feel?
"Should his widow (not her dm) have to encounter this person who caused her dh so much pain, at his funeral where she will be grieving her dh?"
Again, how do you know SIL's behaviour caused he father any pain? How do you know SIL's stepmother will be grieving?
"Personally if I was NC with a parent I’d avoid it because I wouldn’t feel that I should go when I’d been awful to them in life and cut them out."
Broadly speaking, people who go NC do not do it with the intention of 'being awful', but with the intention of protecting themselves from someone who is awful to them.
It's clear that you really dislike your SIL. Maybe she is this awful, wicked person that you portray so very, very vividly and your dislike of her is merited. Or maybe she was right to have no contact with an abusive family, and you are either ignorant of their behaviour when she did have contact with them or you are a bit of a bully yourself who loves to have a victim to kick.
Whatever.
Just bear in mind that funerals are not just about saying goodbye to the dead, but also about gathering with the living. Just because your SIL was NC with her dad, she may have wanted contact with other family members but that was not possible for - reasons. The funeral could allow her to renew those relationships.
Why DO you dislike her so much?