What happens if estate property is sold if there is still pending litigation in the probate court?

Question Details:

My sister, the executor of my father's estate, is going forward with selling my father's home although there is pending litigation in reference to the distribution of his assets. Her real estate agent says that it's none of her business and is putting up a sign tomorrow. Is this legal? Should we file a petition for restraint? What could be the ramifications?

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