Well, he was right about the Sun being the center of the solar system.
Actually, he thought that the Sun was the center of the Universe.
It wasn't his fault, but the Universe is now known to be so much bigger.
His system was a failure in some ways because he kept many of the old ideas.
For example, he thought the planets moved in circular orbits and he also kept to the old theory of "epicycles".
It was left to Kepler to come up with the correct description of the planets' motions.
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I doubt it -- Copernicus never married or had any children.
Polish astronomer Nicolaus Copernicus (Mikołaj Kopernik 1473-1543) was technically a "Junior" since his father was also named Nicolaus. His mother's maiden name (in English) was Barbara Watzenrode.
Nicolaus Copernicus.
Galileo Galilei
the first to formulate a comprehensive HeliocentrismCosmology, which displaced the Earthfrom the center of the Universewas Nicolaus Copernicus