@Kai R. I have been in partnerships that have worked out and have been in ones that have ended poorly, both in the real estate world and outside of it. You're emotionally invested in the company and your relationship with your uncle. I get it and it sucks.
The two pieces of advice I have received that helped me out:
Before you list your contributions, list theirs. You'll be more inclined to recognize what they have brought into the partnership. If it adds up to something worthwhile, then this exercise should change your mindset, allow you to see the value they bring, and make your mindset more amiable to finding a way to work together.
If not, hope is not a strategy. Hoping that the partner will change into the version you want is not a viable way to build a business or frankly live your life. Figure out the best way to end the partnership from a professional and personal perspective and move on with your life. It sounds like you will do just fine.