Irrevocable (complex) Third Party Special Needs Trust Need to Pay State Tax?

In January 2024 my parents created an irrevocable (complex) third party special needs trust for my disabled sister in the State of Washington. The beneficiary (my sister) and the grantors (my parents) all resided in the State of Washington. My father has since past, but my mother and sister still reside in the state of Washington. I am the trustee and reside in the State of Texas. I purchased TurboTax Business to file the tax documents, and TurboTax Business is suggesting that I need to file a State of Texas tax return for the trust. Is this true?

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