Probably not. You have not really provided enough information to understand what is going on in your situation. Since you have received a summons, the only sensible thing to do would be to review it with your lawyer. You likely have only a limited time to respond. If you fail to do so, you may lose your opportunity to object to what your sister is trying to do.
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Attorney Frederick is correct. Retain a lawyer not only to review the summons, but the underlying documentation and assets in the trust. He or she will advise you as to your duties as a fiduciary and how to best respond to your sister. Good luck to you.
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Mr. Frederick and Mr. Pankowski are right, there needs to be more information for a good answer. Do you know who the Trustee of your trust is? You should call them, or have your attorney call them immediately and see what is going on. If your sister has commenced an action against the trust as a beneficiary, it's odd that you are just getting a summons and not previous communications or filings as well.
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