It may be different in the USA, but in many countries there are legal limits on what a pre-nup can actually cover. If the relationship pre-dates the foundation

It may be different in the USA, but in many countries there are legal limits on what a pre-nup can actually cover. If the relationship pre-dates the foundation of the country, it isn't unrealistic that she would have some claim on "Mark's" assets should they break up in the future. For what it is worth, this is really very poor taste.