The joint account matters not.As there's push and shove alread and daddy is whining (is he a licensed electrician), I would strong arm the complaint and just tell'm  "I see you are not going to be happy here so I offer to let you move out immediate."

Long term hold, arm chair investing , flipping ...what is it you desire to do..My advice is follow any path of interest that has the highest wage.

But on RealtyShares let's you partipate at $5k and $10k levels for CS and RC it's usually $25k starting but lately like on RC it's been $50k and $100k on deals with 7-10yrs hold!!!

I should also note this is not a building where much appreciation could be forced- all three condos are in good shape/well updated.

However, you will be forcing appreciation, so there is some potential gain in the form of a "cash out refi" or a HELOC. 

Our divorce judges don't have jurisdiction only 3rd parties (you), and the most they can do is force dad to indemnify mom for damages arising from a breach of the lease.  

(With the $20 plan you get email notification when the system is armed and unarmed.)

Housing in high demand areas of our metro area will make you a lot of money based on the simple economic forces of supply and demand.

Don't force a deal that isn't there.

In the short sale world you don't want to be involved in non arms length transactions or any grey area behavior.