I thought that it isn’t that you don’t trust the person you are marrying to do the right thing after your death. Perhaps if there is an accident and one dies and the other is injured enough that he has to have someone else speak for him. That person might not do what the couple wanted.
But would it be possible to have a will all written and ready to go that is signed right after the wedding?
It appears you have never been in the situation. I am not sure why it would be important to you to not have a pre nuptial agreement.
I have been around for 68 years; and in that time I have witnessed untold numbers of people who, in all innocence, forget what exactly they agreed to or did not agree to. Add to that the influence of children, occasionally grandchildren, siblings, and outsiders and things have a tendency to get very messy.
Both parties, in entering a second marriage, are coming in almost always with different amounts of assets, different philosophies of how to handle money, very often with children and sometimes grandchildren.
In the specific circumstances, his daughter wanted her dad to marry someone else. Subsequent to the marriage, the daughter played all sorts of games until final (several years later and a whole lot of tears) my non-confrontational mother had a head-on confrontation from her. That finally cleared the air on that issue.
My mother was far more concerned that her (then to be future) husband make it clear to all parties (that is, his kids) that she was a) not marrying him for his money; and b) that she had far more respect for him than his children did, and for the relationship he had or should have with them. The latter was perhaps too subtle a message for them, but it was grounded in her concern that it be clear she had no intention of getting between him and them.
Subsequent to the marriage, one of his sons borrowed a significant amount of money to purchase a liquor store franchise. One would think that such franchise would be about a brainless opportunity to make a living, but the son managed to go bankrupt. It was not for no reason that my step dad asked me to be the personal representative of his will rather than one of his sons or his daughter. He was a great guy and a real sweetheart, but he was also subject to being easily manipulated, most particularly by his kids. Again, that was part of having a clear agreement right from the start.
Again, I have no idea why you seem to object to such a pre nuptial agreement. The Church does not object to it.
What would be the purpose of waiting? If one party wanted to set out the agreement, and the other didn’t, I would have more than just strong suspicions that the parties had not actually come together on an agreement. The agreement was in his favor, not my mother’s but it was her position that they needed one. I fully and totally supported her in that. Setting it out settles a whole bunch of issues that can come up later. It is not like a first marriage, where usually there is little or no significant financial difference between the two. For a first marriage, unless both parties were late in life, there would be no need for such an agreement. Later in life, when assets and liabilities may be very different between the parties, as well as differing inheritance issues with children, it may be critical to continuing peace in the extended family.