Our father died, then our stepmother passed away. Will my siblings and I owe taxes when we sell their house?

“My father remarried at the age of 65. He kept his house in the revocable trust where he had control of his assets.”

Our father died, then our stepmother passed away. Will my siblings and I owe taxes when we sell their house?
“My father remarried at the age of 65. He kept his house in the revocable trust where he had control of his assets.”