This option would allow me more cash to deploy but my family would be “uncomfortable” with the living arrangements, but definitely doable.

However, I discovered this wonderful site called FurnishedFinder.com where renters are looking for 2-6 month leases in a furnished place, and they are open to "room for rent" arrangements. 

But, then again, in an arrangement like this, they are taking WAY more financial risk and real risk than you, and only getting 50% of the profits. 

Here is the list of the “dirty dozen” scams.Arrangements that are potentially abusive:Monetized Installment Sales: violation of anti-pledging lawsMaltese Treaty Benefits for Pensions: Misuse of treaty provisionsForeign Captive Insurance: abnormal pricing, implausible risks, the company has no business purpose for entering into the arrangementCharitable Remainder Annuity Trusts (CRATS): to eliminate taxable gainsFraud that is consumer focused:Anonymous Communications: Scammers with the intent of defrauding taxpayersOffer in Compromise (OIC) Mills: Companies that offer to settle your debt with IRS but leave you in a worse positionSpear Phishing: Pretending to be the IRSCOVID-Related Fraud: Identify theftHigh-Net-Worth ActivitiesHigh-Earner Failure to File: taxpayers with over $100k in income that fail to file tax returnsMicro-captive Insurance Arrangements: Nonexistent insurance coverageOffshore Accounts and Digital Assets: Hiding incomeSyndicated Conservation Easements: Unwarranted and inflated tax deductionsAs always, if something seems too good to be true, it most likely is.

Time to change the locks, time to survey the property and what work needs ot be done, time to get the workers arranged, time to arrange getting them access (either I open the door, my realtor helps out, or I give them the keys at some time), etc. 

What you described sounds like common practice aside from the actual terms which are likely a part of your individual financing arrangement 

As a 1/3rd owner she will simply arrange with the lender for that amount, or even 75% of her 1/3rd ownership (25%) be her downpayment.  

Arrange financingFinancing a single-family rental property works a little differently than applying for a mortgage on a primary residence.

It is in a remote location and the previous generaton would like to keep this  arrangement for as long as they remain.

If the plan was for you to move-in, it's best that be arranged as part of the purchase agreement and there's written agreement from the tenants before closing.