Wow. That's not good. I can't help you with the father, but I have suffered with depression most of my life and have been identified with bipolar as well. I have been on and off of medicine for 15 years and although it helps, it is not a cure. However, there is a naturopathic cure for allergies that is being used to treat ADHD and autism as well. I believe it will also treat depression and am trying the treatment now myself.
It's called NAET treatments. You are exposed to an "allergen", given an accupressure treatment, have to avoid the "allergen" for up to two days, and then you are cured. I was having problems getting/staying pregnant and was found to be allergic to progesterone. I was given a treatment and am now 5 months pregnant. My doctor also found that I was allergic to serotonin. I was given a treatment last week, went through the avoidance period and now take liquid serotonin drops for a few weeks. I actually feel a lot better.
It is not an easy answer because it requires time and a little discipline, but it is the only available cure that I have found. My 5 year-old also gets treatments and her nightly nasal drainage problems have stopped. The research has shown that autistic children have shown dramatic improvement over a 6-12 month period, having weekly treatments.
It won't solve your dad problem, but it may solve the ADHD and depression problem. If you want more info, let me know.