As Peter and others have stated you need to get a few different opinions are the work needed, costs, etc before making a decision on how best to proceed 

Keep that in mind and just proceed with the utmost caution. 

So even if you pick a state with stronger protections like WY or NV, the cause of action arose in the state where the tenant fell, so likely that the court where the accident happened would have jurisdiction.

Curious how this will play out in the courts (granted it's LTR) and affect pricing products used for STR such as PriceLabs (which I use but have to seriously manually adjust for very specific reasons).

The violation - depending on your state - will provide a 'cure period' before eviction proceedings would begin. 

Why wouldn’t you go to court?

https://natlawreview.com/article/texas-federal-court-issues-nationwide-injunction-against-enforcement-corporate

Your sibling can use a 1031 exchange to defer capital gains taxes on the sale of the rental properties by reinvesting the proceeds into like-kind investment properties.

1) Yiu REALLY need to know what CA will  allow you to do, I don’t know, but the state may say too bad landlord, you lose. 2) Assuming your attorney (Or you if you’re able to decode the laws that relate to your situation and are willing to go to court in front of a judge against a “sick” kid.) think you have the right to collect the rent I’d give them two options. 

This will depend on what kind of loan you choose to proceed with.