Have you consulted with a lawyer about this? The laws differ from place to place, but I'd be worried the equity you give him may also grant him some sort of claim on the house, which would mean he gets a say on financial things related to the real estate. This can complicate things in the future.
Also - what does "percentage of revenue if we end up keeping and paying it off years later" mean? That after he leaves you will pay him for his share in your house?
XML is good for markup. The problem is that people too often confuse "markup" and "serialization".
"Your brakes operation will resume after this 10s ad"
Or maybe they just don't want to take the risk? https://www.theguardian.com/us-news/2023/apr/29/five-people-killed-in-south-east-texas-shooting-cleveland
Even when you are paying for the product you are still the product.
I won't argue that corporations wouldn't steal other people's work given the chance, but being able to do this is hardly worth the cost of not having copyrights on their own material. A Disney/Pixar/DreamWorks/etc. movie is not a stand-alone product - it's mainly a feature-length commercial for a franchise. No copyrights means that the corporation doesn't get revenue from the the merchandise created and sold by third parties.
Movie pitch - to pay all its lawsuits, OceanGate launches one final desperate mission to the wreck of the San José.
And feel old? No thanks!
Which was only 10 years ago.
So if you don't sell it, and instead rent it out to other people, he'd get a portion of the rent the future tenant pays? And I don't supposed said future tenant will also get equity?