Your date sounds exciting! Such a shame there wasn't a spark if you guys managed to talk for so long, but it's so exciting that you did it, took a risk and met him, and even better if he becomes a good friend. I love having male friends- so much easier for me to speak to than girls (and so useful for understanding the male mind!)
I'm not sure what to advise on your parents. My instinct would say to listen to them both and be a trusted person they can vent to without judgement if you can. I'd be wary of getting involved- they've been M a long time and their R probably has idiosyncracies to it that are subtle and perhaps not always obvious to their children, although I know you're very perceptive.
Do they know that you're DBing? If they're aware of what you're doing, and the principles behind it of one partner being able to change an R then they know they can ask you about it and that the information is there. You can't control what happens in their R, however scary the thought of them not getting on might be..... I guess what I'm saying is that you should be there to offer a point in the right direction (maybe a copy of DR) if needed, but don't make yourself responsible for trying to fix things for them....
Feel free to discard any of the above if you want to!
L. xx
PS. I agree about doing a 180 on your friend. Have fun at Take That and give Gary a kiss from me if you get close enough
"Your time is coming, don't be late" Great lyrics- Gary is a genius- deserves all the kisses he gets!
(Man, that's started a whole Take That Youtube fest for me! I also love the Garden- I hope they do that at the concert too. Gary's voice is just amazing)