Richard Woodville, 3rd Earl Rivers (1453 – 6 March 1491) succeeded his brother, Anthony Woodville, as the third Earl Rivers. He was the son of Richard Woodville, 1st Earl Rivers, and Jacquetta of Luxembourg, and was the brother of the English queen Elizabeth Woodville.
the 1st Earl Rivers had at least 3 children.
He had the 2nd earl rivers and the 3rd earl rivers and his daughter, the 2 mens sister English queen Elizabeth Woodville, mentioned in the question. The AI failed to match the whole family up.