babysteps - that's why I sound like such a monomaniac here, about denial and remembering and pattern recognition. a lot of the time, the only way to get through denial is to realize that something is happening over and over and over and over and over and over and over... and then to look at what that something is, which parts of it keep happening, and who or what is around when the repeats occur.
family, if they're healthy, can be priceless in helping with this process, but if they aren't healthy, then that will be where the denial techniques were learned and perfected in the first place. in that case, a good therapist is worth his or her weight in gold, just as bean has said here.
it's true, we all have blind spots. but you know what? recognizing that and being prepared to discover that you have them - gets you more than halfway to being able to deal with them!
for instance, i'll tell you one on me.

.
hops put up a timely reminder just a couple of days ago, about the risk of 'acting out' family of origin [FOO] conflicts by becoming argumentative here, especially at the end of the work week.
coincidentally, i had just realized, after I had logged off that evening, that i was getting enmeshed in an argument [never mind why], and that it was
the end of the work week. the following morning i saw hops' post [which ironically, tied in to an earlier post of mine where i had noticed and commented on this exact same pattern here!] and said to myself -- yeah, she saw it too, glad i caught myself and won't let this eat the weekend.
then i went back to where the donnybrook was and made the point i thought was most important - in a detached manner - and disengaged from further conflict.
now, if someone had confronted me directly, before I'd caught on myself, i'd like to think i would have stopped in my tracks and said, whoa nelly, yes, this is a displaced FOO fight, and responded constructively then and there.
but if i was still failing to see the pattern, or still blinded by emotion, i might just have included this new person in the FOO fight.
this sounds complicated but it isn't. the bottom line is - using your memory, looking at patterns, and trusting your feelings of discomfort when the same things keep happening to you, are the best way to check for denial - or blind spots - from your skin inward.
[I call them "blind spots" when I go "ACK" and smack my forehead as soon as I see them.]
[I call it "denial" when I go "no, wait a minute," and start bringing up a lot of farfetched justifications to excuse my behavior, as soon as I see it or someone criticises me about it.]
[I call it "assertion", when someone criticises me about it, their criticism isn't valid, and my justifications aren't farfetched.

]
[There will be times when your critics have an agenda - ask bean about her previous work group - so it's important to know that the third reaction is sometimes the correct one.]
Denial that's walking around in other skins often sends similar pattern - repeat clues, but it's easier to see the patterns, and easier to remember past incidents because we are on the outside, then, and we have less of an emotional self-protective investment in forgetting them!
I'm not being critical of anyone, here. As noted above, I had one foot in the swamp this week myself. Tired, cranky, and concerned for the welfare of a friend, and I was off and running. Nothing like being a free lab demo for everybody else...
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sea storm - here are some links to info on men, alcohol, and osteoporosis. This is not cheerful stuff, but it is from highly reputable sources, so if you think anyone close to him might be able to take in the information, these links could be shared and will be hard to discredit. [although denial can find a way to discredit pretty much anything.]
http://www.fda.gov/fdac/features/2002/502_men.htmlhttp://www.niams.nih.gov/bone/hi/osteoporosis_alcohol.htm [do a word search on this page for the word 'testosterone']
http://www.medicalnewstoday.com/medicalnews.php?newsid=3983http://www.mayoclinic.com/health/osteoporosis/DS00128/DSECTION=4 [bottom of page, do word search on 'alcoholism'].
Good luck. I'm sorry you are a helpless witness to something so sad.