Blood siblings can break up their relationships for property, and if the Seeds/Phases of the Bitcoin wallet are left between them, they may betray them at some point. It would not be right to trust your own wife in this case because someone can betray a relationship for the sake of Bitcoin.
Trust is built and earned and not just something that happens all of a sudden. Blood relatives can turn against each other for the sake of money, and if we are to put all the things that happen around the world in front, we can never be able to trust even ourselves.
There is no point in getting married to someone you don't trust, but then again, who are those wealth made for if you can't even trust your family with them and they can't access it when you are unreachable?
It's a risk that should be taken but should be reduced to the minimal by either trusting the phrase with your spouse without her knowing what it is and the passkey to someone else who also doesn't know where to get the phrase, and the instructions could then be given to a third party, either an institution, who will then later hand it over to the lawyer who will do proper reading if need be.
If you have underaged children the ideal person to transfer Bitcoin hodling to is your wife. A good mother would always ensure that the children have the best of life. But now, some mothers have been very wasteful and misused all they inherited from their husbands. People change when it comes to financial matters..
If you don't want your coins to be a donation to the Bitcoin system, you would have to plan your future. For me, I am not using a third party, my coins will be entrusted to someone I trust. Yeah it's difficult to see trustworthy persons but you have trust someone..
