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Good evening. She as the executor of his estate can sign a contract for sale of the property, and the siblings cannot bring any action against her for signing another contract. Under NY law a contract for real estate becomes valid when all parties sign the contract. There is nothing illegal or fraudulent in her agreeing to sell by another contract. She can refuse to sign their contract.
Please have her sit down with an attorney to represent her interest so that the sibling do not cheat her or some way steal her portion.
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