I have an elderly relative whom shares ownership of a property with two others. If the others with whom she shares the property decide to sell the property at a public auction, would my elderly relative know? If she did know, could she put in a bid at auction? How would one know if a particular property was to be auctioned?

Lastly, what is the typical length of time it would take to sell a property at public auction if one of the owners is not in agreement with the sale?