My parents separated when I was in my early teens, and soon after moved 4 hours away from us. Growing up, he gave me no more support than he was legally obligated to provide (though welcomed my visits and constantly tried to talk me into moving in with him). In college, I worked three part-time jobs to help pay for school; my mom helped out a great deal financially. My dad contributed zilch. After I turned eighteen, my dad offered but the most token acknolegement of my existence.
After their divorce, it was revealed that my dad had a drug problem. He got fired from several jobs for getting caught stealing/doing drugs but always managed to somehow weasel out of any legal responsibility. It was when he finally got really cornered about the issue that he conveniently Found Jesus :rolleyes: moved 200 miles away and wasted no time in starting a new family and a new life.
But old habits die hard. Faced with chronic back pain, he abuses pain medication. I started noticing something was up when I’d always call him and it seemed like he was super groggy and incoherent. When I’d go to visit he’d lay on the couch smoking a cigarette watching the History Channel. Any family events he’d stay behind, he never wanted to do anything or go anywhere.
It came to a head when I got engaged and my fiancee pointed out that even though I talked constantly about her to him on the phone, he showed absolutely no interest in coming down to meet her (her family is very conservative and aren’t comfortable with her making overnight visits, so the only practical option was for him to drive down here for the day/weekend). She also brought to light that I was always the one planning trips to meet my dad; he never called me and said, “Hey Incubus we’re going to be in town want to hang out?”. Now the ironic thing was that he WOULD come to the Bay Area from time to time to visit his family, but conspciously failed to mention it to me until the last second. Both Thanksgiving and Xmas last year he showed up with no warning and no prior indiciation he’d be in town, precluding my fiancee from meeting him.
She finally did meet him when I cornered my stepmom about it and pointed out that he hasn’t shown any support whatsoever in my wedding (lots of offers from my family to help in any way they could, from my dad: zilch) nor any proactive desire to see me even though I’ll go up and visit him many times a year.
This last weekend I met him for father’s day. He’s in a sad state 
He’s 6’6" but looks like he weighs 120 lbs, his back horribly hunched over, all his teeth are gone, and he was utterly incoherent and apparently high out of his mind on pain pills. The weekend was particularly awkward; my stepmom says he overdoses on pain medication, but he keeps managing to find them. He’s totaled two vehicles and my stepmom doesn’t allow their two boys to ride in the truck with him. When we met him for Father’s Day breakfast at a restaurant in their town, he took his truck because he didn’t want to go to church with my stepmom and I had to drive home afterward. When we met up with him at the restaurant half the truck’s front license plate was gone and there were deep scratches in the side of the truck. When asked what happened, he said one of my half brothers must have hit his truck with the basketball.
TLDR, my dad is a drug addict, old beyond his years, disaffectionate toward me and seeing my peers have functional dads just makes this Father’s day that much more depressing.