Been there, and back... ick.
This thread hits a chord with me; I've dealt with a drama cycle somewhat like what Jim was alluding to.
This case with the BIL doesn't sound like a suicide attempt so much, but it's certainly way out of line from what I'd demand of anybody who I care about (or lived with someone I care about). On the subject of suicidal tendencies, experience has taught me to: 1) get help, and 2)
trust your gut. While you may not be a qualified Psychomagician, it seems that there's never a Psychomagician handy when you need one, so you've got to do the best you can and not beat yourself up about it, regardless of the outcome. Maybe he's prone to suicide, maybe not, but one of the strongest indicators (THE strongest?) of a person who will complete suicide is someone who's attempted it before, no matter how light-heartedly they try to dismiss the past as a fluke.
I've observed in my very limited experience with a friend that the whole suicide situation is nothing like I'd learned the "common knowledge" about. A previous poster was spot on in observing that it's often "the last person you'd expect". There are usually warning signs, and they're usually unrecognized and ignored. Loathe as I am to casually involve the State in someone's personal affairs, I would call the authorities in almost all situations like this. If the person is "crying for help" or just trying to get their way, a little trip to the ward will cure them of that quick-like. If they actually do need the help, the earlier they get it, the better. Unfortunately, from my experience, it may take several passes through the ringer before things improve. I've noted complacency in some public mental health staff, a sort-of "scrip em and ship em" attitude. While that may work alright at the DMV, when you're dealing with people whose thought processes are
detached from reality (but not to the point of gnawing on doorknobs or shrieking wildly), you can't rely on their better judgement to see through the day.
That's the trouble with the "if someone wants to off 'emself, far be it for me to stop 'em" outlook. In the case of someone who's actually "mental", they may not want to go through with it, but they're genuinely losing their grip on reality. (But then again, who's to decide if I'm fit to decide what's right for me? That's a tough question, and until someone comes up with a good answer, I still lean towards leaving the power with the individual. I'm just pointing out a problem.)
In my instance, as best I could figure out, I wasn't dealing with an "I'll do this to get my way" attitude; it was a person who was unable to effectively deal with stress, combined with a personality that channeled nearly any meaningless little problem into a strong sense of personal failure, leading to... more stress! This made for a vicious little feedback cycle. The damping factor which kept things under control most of the time, was sleep. Now, when you take this kind of system and add college into the mix, things get ugly: lots of hard work, close living quarters with strangers, and extended periods without enough sleep. That's much more stress going in, and much less sleep damping the cycle. All of this was kept inside and never spoken of, until the stress got to be too much, and the person just went Chernobyl. Seeing someone you care about (or heck, probably even a stranger) melt down like that, to try to reason with them as you can kind of sense in their eyes and tone that they're drifting off of the rails of reality, it really gets to you inside. I'm not talking about some Hollywood "I see dead people" theatrics, either, just subtle changes, like the kind of personality shifts you'd notice after being re-united with a friend or relative who had been away for a year. The whole thing was intensely ugly for all involved. (On the other hand, dealing with this sort of thing made whatever random problems I'd been having in life seem downright jovial by comparison. Yeah, I was really reaching for a silver lining.)
The creepiest part, I'd say, was talking about this all with said person after all of the lights-sirens-confinement-medication business had died down and things had settled back into a usual routine, to try and piece together what the ride was like from the cockpit. It took a while to get past the shame and regret, and it was creepy stuff.
On my list of "things to do if I happen to become an all-powerful diety or otherwise gain control of the Matrix" is to put a stop to stuff like this:
http://www.voicechasers.org/News/mkbobit.html
http://www-tech.mit.edu/V121/N70/70shin-timeline.70n.html
Anyway, enough of my babbling. Take care.
-PH