Tenant said the flapper valve on the toilet sometimes stuck-she paid the bill and arranged things with the water company...but in this day and age I'd like to think the water companies would alert users if there is a massive and continuous spike in water consumption.

Can you imagine taking the time to find a new place, pay the despair, set up utilities, arrange for a moving truck/company, packing and unpacking everything, changing addresses everywhere, etc etc etc.

I am trying to be understanding since this is a difficult time for the family and they certainly have many arrangements outside of the sale of the house to consider.

If the tenant does not pay and doesn't make a payment arrangement with you, then you proceed to evict like any other nonpaying tenant. 

Their management agreement is win-lose arrangement. 

Are there any verbal agreements or arrangements between the current Landlord and Tenant?

You might want to do a little research on what are called pay for delete arrangements depending on how old your collection accounts are.

However, enforcement of due-on-sale clauses can vary, and some lenders may not immediately call the loan due if payments are current and the sale does not trigger other concerns.Disclosure to Buyer: When selling a property "subject to," it's crucial to disclose this arrangement to the buyer.

If it is because the tenants are not home, then you need to arrange to be there.

This can help offset your mortgage and other expenses.Single-Family Home: If you choose a single-family home, you may have the option to rent out rooms or a separate unit if there's space, but the income potential might be lower compared to a duplex.Affordability:Duplex: Financing a duplex might be more challenging, but the rental income can assist with affordability.Single-Family Home: Single-family homes might be more accessible for first-time buyers, but you won't have rental income to offset expenses unless you choose to rent out a portion of the property.Property Management:Duplex: Managing a duplex involves dealing with multiple tenants and units, which can be more time-consuming than managing a single-family home.Single-Family Home: Managing a single-family home is typically simpler since there's only one tenant.Privacy:Duplex: Living in a duplex means you'll share a building with tenants, which could impact your privacy.Single-Family Home: Offers more privacy as you won't be sharing the property with renters.Market Conditions:Duplex: In some markets, duplexes may offer better appreciation potential and cash flow due to the rental income.Single-Family Home: Depending on the location, single-family homes may have better long-term appreciation potential.Long-Term Plans:Duplex: If your goal is to accumulate rental properties, starting with a duplex can be a good way to get into real estate investing.Single-Family Home: If you prioritize a more traditional living arrangement and don't want to manage rental units, a single-family home might be a better fit.