Account Closed  depends on the size and location of your unit. 

It is a great location, only blocks from the University of Arizona.

This is the first payment from the tenant under the lease (aside from the security deposit), and we have documents (and seller confirmed) showing it was 10 days late.

Without this forward thinking I would be entirely dependent on social security .  

With this being said, unless there's a specific reason for mom needing to be removed from title (i.e. social security benefits) it may be more prudent to pursue placing the home within a trust with your husband named as a primary beneficiary.

All condo's have waterview and bayview so I think all can be sold in 3 years due to location.

Property is located in a quiet neighborhood  in Johnston RI.

The vast majority of lawsuits against Landlords are for wrongful eviction, security deposit disputes, and Fair Housing Violations.

If this is not the case, then assuming there is sufficient equity, the trustee might obtain a secured cash out loan against the property (probably at higher rates then conventional commercial) and after the loan funds, the trustee would then distribute the cash to the siblings who want to be bought out, and the 4plex to the sibling who wants it with the loan still in place. 

Cash paying tenants can be very unreliable in these types of locations.