Book exploring grief for a crappy person

I’ve had multiple family members pass in the last three years andworking through my aunt,uncle, and grandpa passing was rough . They were great people and I have lots of healthy coping mechanisms.

Now my grandmother has passed, she was an ASS! Working through her death has been odd & I feel unsettled. I’m hoping for any recommendations on working through grief for a very complicated relationship that leans more negative.

*I love non-fiction but not so much self help!