I was thinking about all this "no legal obligation" because it's a "personal favor" thing, and it was a scary thought. Look, you live your way, nothing criminal, just the way you understand it, and your friends shouldn't judge you, because you are who you are. Then you accept a favor from a friend, or your spouse's friend, or a friend's spouse, for that matter. You think that now your friend has a right to expect a favor from you. Right? Wrong. Because it's not what your friend has in mind. He (or she) thinks, that because he is doing you a favor and is already there, he is entitled to snooping around. Well, maybe not for purpose, but just because he "couldn't help but notice" while doing that. Say, your friend was picking out old books from your garage for a charity drive, or helping you organize something, or looking at your car, or whatever. And found there something that you, probably, shouldn't have left out there, but as it happens, you did. There was a pile of old letters, or cancelled checks, or life insurance policy, or will draft, or car/house papers, or whatever you can think of. Now, that friend not only read the whole thing through, but decided that something in this document is not in your or one of your family member's best interests. It's doesn' matter what you think, or that you get angry at him for intruding, now this friend will run your life the way he considers is best for you (or your family member). He knows that he is right, and feels himself a hero, because he is doing the right thing, even if you are mad at him. Maybe you will understand one day what he did for you. (Even if it breaks your marriage, or create other problems in your life.)
You know, Marie from "Everybody loves Raymond" is one of those. She is always doing it for the best interests of her loved ones.
I don't know about you, but to me the thought is scary. I would be careful accepting big favors from friends.
Wayne, I've heard of many cases like your friend's, some of them date over 50-60 years back, some are new, and happened in different countries, so the world doesn't change. The point is, in 100% of those cases no one listened to bad things said about their prospective spouses by their friends. People never learn from someone else's experience. They always hope for the better, and trust their significant others more than any friends. If it doesn't work out, the fact that "you told him so" doesn't matter that much any more. If it does, you might be excluded from the couple's list of friends, because "you don't like his wife". But if you feel better when you do so, and "it makes all the difference in the world", then I can't judge you. Do what you should do.
Look, people can never agree on everything, and often it's just plain impossible to change someone's opinion. I guess what we do here is exchange opinions, not trying to change each other's mind, right? We all are adult people, and it's just too late to drastically change. So let's just accept the way things are: people can have different opinions.
Stella