In_The_Darkness, I'm so sorry, shocked, and saddened. There's a personal side to this for me - one of my favourite teachers when I was about your age turned out to be a pedophile. I had no idea, no clue at all.

Regarding your father, you are close to the threshold of adulthood; I hope Father levels with you about what's going on with him. My sincere best wishes for your father's health and your personal peace of mind.