I can teach people how to safely & intelligently invest in apartment buildings, and if there is room for us to do deals together, awesome.  

If it is the only option, you may be able to find a company that will take on that liability and service the well to ensure it is safe. 

Are there any B and C class safe neighborhoods to recommend?

I rehab for selling and rentals, I think sticking to the same products is always safe.

We have a duplex in the midwest that we have been discussing selling....Background:A few weeks ago tenant A called the police on tenant B due to a major domestic dispute they could overhear, they did not feel safe.  

There's nothing wrong with fixing something that is broken, but you shouldn't be making improvements to things that are clean, safe, and functional and that were fully observed by the tenant during the showing process.

Most travel nurses are looking for a safe place convenient to the hospital they will be working at.

Wouldn't you want to know what needs to be one to make it safe and livable?

Advanced tools like machine learning and AI enhance the accuracy and reliability of predictive models.Psychological Benefits of Thorough Due DiligenceBuilding ConfidenceComprehensive due diligence boosts investor confidence by providing a deeper understanding of risks and rewards.Supporting Subconscious Decision MakingData supports intuitive judgments and enhances the overall decision-making process.Reducing Fear and Increasing CertaintyBeing well-prepared with data reduces fear and increases certainty, leading to more confident decisions.ConclusionThorough due diligence is crucial for making smart and safe investment decisions.

Granted this approach may not create generational wealth, but it will provide your parents a safe path forward.i would not be looking to expand their RE holdings.