Answered on Nov 20th, 2018 at 11:23 AM
Bankruptcy can at least temporarily stop the foreclosure if filed by the current owner of the property. The HOA lien would need to be dealt with somehow and there are different options for doing that depending on the specific facts involved. You mention that your father owned stock in the "Co op" (which I assume means condominum). That implies that the condominium is owned by a corporation or LLC.
In that case you would be talking about a Chapter 11 case for the corporation.
You should have a consultation with an experienced bankruptcy attorney in the area where the property is located.