On August 4, 1782, in St. Steven's church in Vienna, Wolfgang married Constanza Weber.
She was the daughter of his musician friend Fridolin Weber.
Wolfgang's letters
do indicate that he loved her very much.
They had two children who lived to adulthood, Karl Thomas Mozart and Franz Xavier Mozart.
Neither of them ever married or had any children, so Wolfgang has no living descendents.
Franz Xavier did become a composer, but nothing like his father had been.