... There must have been much love between you.
It was, like many other things in my family, an odd type of love.
It was never expressed openly, especially among three brothers (my sister was killed by a drunk driver when I was 12, so she wasn't part of the later-years scenarios). We kidded around as brothers do, doing nasty things and playing awful tricks on each other, but yes there WAS a strong bond there.
What bothers me the most now, as I always knew it would, is that I'm the last one in line - I have to make plans of a solo nature.
And my condolences on your father's death - it must be frustrating not to know what really happened, but perhaps in the end it doesn't really matter for, as you said, if it wasn't one thing it would have been the other.
As for your friend in school - now THAT type of suicide causes me grief, because it isn't medically necessary. But the passions (and the illusions) of youth run quick and deep, and unfortunately we were not all made equally strong in our ability to handle adversity at such tender ages.
I had a student once - a girl, 15 years old and a prodigy at martial arts. Before I finished my first month of instruction with her she was performing at an advanced level. I urged her to attend a larger school where she could have access to tournaments (I was a one-man show and didn't belong to the proper "circles") but she insisted on staying with me. She couldn't afford tuition, but I made an exception in her case.
But as wonderful as her physical ability was her mind was clouded by an abusive father and a non-interfering mother, to the point where, despite my best efforts, she fell in with the wrong crowd and began abusing a few powerful antipsychotic medications that her social service doctors had helpfully provided a prescription for. She spiraled out of control and one day just stopped showing up to class.
I lost track of her for a while, then found her hitch-hiking on the road one day, looking like a drowned rat and without any real indication of life in her eyes. I put her up for a while but it wasn't enough and it came too late.
A week later they found her in the Susquehanna River. No one can tell (or will say) whether she jumped or was abducted, but the end result was the same - the useless loss of life before she even became a woman.
If it is true that we in large part form our opinions and prejudices based upon life experience, then this would explain my hatred of both unethical prescriptions and abusive parents.