If my father made my brother a co-trustee on his trust, can my brother now remove me as a beneficiary?

Question Details: My father was in a hospital drugged up with psychiatric drugs and a few months later found to be incompetent to handle his own affairs by 2 doctors. I was told I was a equal in the Will/Trust. Have reason to think my father while in hospital signed a new will/trust with me excluded as a beneficiary. Brother is secretive on details. Father still alive in dementia ward. Can I fight this?

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