Hire lawyers for both groom and bride, follow rules fully, your prenup will be enforceable. Judges don’t whimsically throw out prenups. However, having unenforceable or illegal clauses or simply not following proper procedure can make things complicated. Again, separate lawyers for both parties and proper procedures will make things very enforceable.

If you have children then of course you will pay child support, but if you are ultra rich that will be a small part of your fortune.