Methods To Quit Smoking

shes been smoking since i was born.
im really getting sick of it.
ive tried everything, guilt, giving her the facts that she will eventually die from it. i dont know what else to do.

My mother in law is dying of cancer, given 4-6 weeks. She is a smoker, there are 4 family members who live at her house, all smoke. It’s as bad as a bar. She is planning on dying at home and wants to see her Grandson, my son Ty. I am 7 months pregnant, and can’t stand to be around smoke.
They don’t stop smoking when he comes over. Last week, my husband took him and they both came home smelling awful. My son was congested that night and for two days after. My husband hates it too, but feels we are being out of bounds right now asking her to stop her one enjoyment when we visit.
I was told it’s pretty ballsy of me to even consier asking them to stop smoking in their house when we come over (by family members). I don’t want to offend her or cause a rip in the family right before she dies.
Should I just stick it out the next 6 weeks so Ty can spend time with his grandma before she dies?