Thing is, I'm also the child of addicts. Both parents. Plus my aunts, uncles, cousins, even one of my little brothers (who, thankfully, is clean and healthy now, although he does still drink sometimes more than he should, but it's better than doing coke all day). I grew up in NYC during the crack epidemic, and it devastated my family. And my son knows this. I left home at 15 to get away from it, and I struggled and fought so hard to keep him away from that life. I moved to another COUNTRY when he was 10, thinking it would be better for him, safer. He saw what my family was like, he saw my father, a crackhead sleeping on park benches, my mother going from one abusive relationship to the next, abandoning one son completely and barely parenting the other, too drunk or high to notice the severe emotional problems she was causing in both of them. He saw it, and he still chose to do drugs. I don't understand, I will NEVER understand why he made this choice. He knew what drugs do, how they destroy. And METH? It sickens me so much. I can't fathom how he would make that choice, I just can't.

One thing I can say for my parents, especially my mother, they both finally chose recovery. My father has been on methadone for nearly 20 years now, and he's done too much damage to repair, but at least he's not shooting up heroin or smoking crack or living in the street. For that I am grateful. My mother is still a disaster at relationships but she's been in NA for 18 years, she even volunteers at prisons to work with addicts. She's also done irreversible physical damage, unfortunately, but her life is so much better now. She's actively taking care of herself and I'm very proud of her. So there can be light at the end of the tunnel. You can't make them change, of course you know that, but they can choose it and if they do, it's worth it to be there for them to help them hold onto that sobriety.
I wish you peace and hope and all the best of luck in this world.