This was painful and and deeply touching read. Much respect for sharing such a personal story.
It's terrible when parents act like this towards their own children. But as @dandesign86 stated, it's a big probability that he went through something similar when he was young. The big difference between you and him is that you were always aware that his behavior was unacceptable. You saw that clearly from the beginning, and wanted something better for your own life. I can't even begin to fathom how hard it must have been with the disease appearing on top of all this.
I do know my share about trying to live up to other peoples expectations and agendas. It's exhausting, both mentally and emotionally (even physically). I always admired you for quitting your job and pursuing your passions. In my view this is the way to go in life, something I've been thinking since I was quite young myself (although this belief has not always been followed up through action).
Just wanted to say that I have an enourmous respect for you as a person, for your work here on steem, and that I much enjoy your comedy. It appears you've found an excellent niche, and I'm happy to see the handome support your jokes receive. As for your music, I'm always looking forward to hear more. Just heard your zelda theme drum cover, loved it!