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I am afraid you will need the co-operation of your younger sister, before instructing Chorus Law to act. This is because all Executors have to act jointly, and Chorus Law will not be able to progress anything until they have instructions from all 3 of you.
If your younger sister is in agreement, she can "renounce" her position as Executor, meaning that she does not act as Executor, and this would then free up you and your other sister to act as the only Executors.
I am afraid there is no legal quick fix if your younger sister decides to delay matters/make up her decision concerning her Executorship and is really more a family issue that you all need to try and resolve.
Sorry I can't give you any more positive news than this.
Thank you for your advice. It wasn't was I was hoping for, but in my experience things rarely pan out how you would like. I now have the rather unpleasant task, along with my elder sister, of submitting to my younger sister's will in this matter. It sticks in my craw a great deal.
Many thanks for your positive feedback.
Good luck, and hope it goes well for you.