No, he married Marie Antoinette, his second cousin once removed and an Austrian Archduchess.
Tuberculosis
Louis xvi married to Marie Antoinette of Austria in 16 May 1770
It was an arranged marriage that Maria Theresa (the mother of Marie Antoinette and Empress of Austria) and Louis XV (the grandfather of Louis XVI and King of France) arranged. Austria and France had been long time enemies and Maria Theresa and Louis XV thought it might do good to their relationship to have their countries united by a marriage of their (grand-)children.
Louis XVI (the sixteenth / seize)
She married Louis-Antoine, duc d'Angoulême, her cousin. He was the son of Count D'Artois, brother of Louis XVI.
His mother was Marie-Josèphe of Saxony and his father Louis de France.
No, Louis xvi is not single.
Louis XV was the grandfather of Louis XVI
No, he had a mother who happened to have the same name as his wife!
Louis XVI never had a grandchild.
It never happened. She married King Louis XVI.
Louis XVI of France.