I am so sorry for you all
People with asthma often respond well to the dry air in the deserts in the western US, somehow it seems to help clear the passages. I can also imagine the landscapes there being comforting ~ they are so empty, they feel like being a step closer to the beginning of the world or maybe heaven if you believe in that. It doesn't get cold in winter, not if you stay in low elevations.
My mom's best friend's daughter committed suicide when she was 22, she had a brother who was about 5 years younger. It's been very very hard for them, and it took them years before they realized inside their hearts that there was nothing they could have done, and that all they could do for her was respect her wish. But they also realized that suicide is not contagious, the son learned early in life what ruins it leaves behind, so please don't worry too much about your younger son. He's really not at extra risk.
I hope to never experience such overwhelming pain.
I'm wishing you strength and love papa.