I have listed several homes under these circumstances and often find that there is one of the owners (who may or may not be siblings) in dissent. In the end the person who has been assigned by the courts gets to make the decisions with regard to the sale of the property. Hopefully, this will happen quickly and enable everyone to move forward.
I sold an estate property last fall where there were 5 siblings. With so many people involved it does take much patience on the side of the Realtor. When any paper work needs to be signed, from the listing contract to emailing everyone with market updates, and finally, to signing all the documents when a buyer came forward, all fine siblings received the same emails and documents. Oh by the way, 3 lived in outside the Portland area.
Making 5 people happy can be done. Where do you want to start?