The way you speak sounds an awful lot like the I'm a Rofschild Axe Me Anything thread….
So the house of Rothschild allowed someone into their house and it has done a lot of damage? Sounds like your rival sent in an excellent spy that you haven't managed to get out, and that spy is going to destroy you from the inside out.
Your rival has more gold, more money, better technology, his own personal military, and is backing you into a corner.
Your family has the banks, can print money, has access to ancient documents, has a much smaller personal military, and has lesser technology than your rival.
How do you propose to win the contest?
I want to know how you propose to get your wolf in sheep's clothing into your rival's organization. He managed to get into yours without any of you knowing. How will you get your counter-spy into his organization? Or can you?
Yes. Yes you do. The majority of people don't know it, but you have a rival, and he is destroying your family's empire. I know of exactly two of your family members that will survive his purge of your family.
Have you not found any weak spots in his organization? Even among his associates? Sounds like you need better intel than what you can currently afford.
Your family should have kept its hunting lodge. That would have been your last fortress.