Wife or children they are humans as we are, money changes the mindset of every individual and it only takes a well disciplined (some though) person to avoid such temptation.
Of course, they are also human. But since they are the closest people, ideally they should be more trustable than other people. We also work for them, so it makes sense if we trust them. Also sometimes the mindset can change, but we must know well them for a long time. We must understand very well whether they can be trusted or not.
They can be the closest to gain our truth but we have cases that the trust is not seen within rather is gotten from an outsider and it will be the best decision ever made, yes is family but some families ain't really your family be you the wife or children. It might feel bad but the chances we take in life is just covered with 100% risk so trusting an outsider can be a second choice in this case.
Each person should have their own way to secure their asset. It is okay if you share the information for a half of your asset only. But I have another way, I share all the information about my investments to my wife and children. Instead of losing a half of my assets when I die, I'd better tell everything to people I trust.
Come on brother, I know it will get to this death thing, fine let's put death aside. I think without death in play it would still be ok to make it look like is a win win for both parties which to me it is, meaning that the wife should know about half of it and you getting the other half, that's for security reasons because you have no idea what might get into her head and boom you're losing everything.
But when death had to come in I think letting it out would be nicer but I'd rather keep half of my assets on my will and the other as a test run to see how they behave.
That's why it is important to learn the children about morality and religious values. So, they won't be the people who will harm us in the future.
It doesn't change a thing, a pastor can decide to be the evil that destroys a happy home, people do change because things, ideas of various kind get into their head. You can't be 100% certain that if you teach your child/children the ways of the Lord that he's going to stay that way, no he won't, life is a choice and is a 50/50 chance if your child keep to what he or she have learnt or being taught.