Probate deal

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I have a seller who has already started Probate through one attorney but the issue is the attorney has been taking forever and the properties have been in probate for 3 years. The sellers put up 5k already and only owe her 1k when it is done.. crazy I know. I wanted to give the sellers to another attorney who will get it done asap and not take forever but didn't know what I can do with this? What legal right do they have to either get that money back or use another attorney and is there anything I can do to get this through the process sooner