my mom has terminal cancer what books will make me feel better

None.
I hope you're not serious, but in case you are, my only advice is to stay with her as much as you can till the end, whenever that comes. It's my only regret as someone who lost a parent to cancer.

The book about spending more time with your mother and not reading.

>>8731113
>>8731117

I mean for the grieving process.

seneca

>>8731094
Roughly in order

When Breath Becomes Air
Being Mortal
The Worm at the Core
The Emperor of All Maladies

and maybe some cognitive behavioral therapy/mindfulness books like Feeling Good, Mindfulness in Plain English, or Meditations by Aurelius.

>>8731094
The XI Torments of Hell

Mortality - Christopher Hitchens

7 Essays from when he was dying of cancer