Hello, I jointed BP Pro today, and this is my first post.

Are you sole on title now or still joint? 

As far as the paint, these tenants genuinely spent a lot of time and money *trying* to fix the situation; they just unfortunately made it much, much worse than if they had done nothing at all. 

Joint tenants generally means the split is 50-50. 

Genuinely caring for people and adding value to others. 

You could take title as tenants in common but execute a Joint Venture Agreement.

I genuinely need answers from professionals.

The theory is that any money your parents saved into their 401k's while working was probably done pre-tax & saved them potentially around 22% in taxes (most common joint tax rate). 

They can enlist the help of the court to fix genuine issues, as the states that I know of have escrow systems wherein a tenant can pay rent to the court instead of the landlord until genuine issues get resolved.

I'd suggest joint venturing on one project (flip, one rental property) and seeing how you work together.