On the day my stepfather died of brain cancer, he changed his trust and left everything to my sister. Do I have any recourse?

"I had a falling out with my sister two years prior to our stepfather dying, and she started manipulating my mother to make her the executor of the trust."

On the day my stepfather died of brain cancer, he changed his trust and left everything to my sister. Do I have any recourse?
"I had a falling out with my sister two years prior to our stepfather dying, and she started manipulating my mother to make her the executor of the trust."