Estate Law Questions? Ask an Estate Lawyer.
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As long as your parents were of sound mind at the time they removed your siblings from the trust, and as long as there is no proof that you took advantage of your parents for personal gain, etc., then you should have a solid basis for defending against any claim.
That said, there's no way to prevent your sisters from suing the trust or even you. But, the issue is whether or not your parents acted on their own wishes or whether they were forced/coerced.
As long as you acted in good faith as the trustee and did what your parents wanted, etc., you should have no issue.
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