I have no idea how to act towards my dad, I know it's something that should come naturally but I'm not good at judging people. I live in Scotland and he served in Iraq and Northern Ireland, he came back had me then became a heroin addict. Even went so far as to hide drugs in my room when I was a toddler, it split my parents up and I lived with my mum. Most of my memories of visiting him are dark, he'd take me with him when he went shoplifting because it gave him a high. Other than that it would just be the two of us in our old house watching depressing movies or listening to depressing music while he bombarded me with his thoughts, stuff like "I'd kill myself if it weren't for you" which I know is bullshit because to this day he never tries to contact me unless someone on his side of the family guilt trips into it. He hasn't had a job in over 10 years and is wasting his life away on government benefits, doing nothing even when I try to engage with him. Part of me always respected him for being a soldier but I don't know if I should be doing more to help him or let him lie in the bed he made for himself.
I'd add that he's off the smack now, but just as hooked on prescription methadone. Still smokes weed and takes other drugs casually.