Wagner's second wife, Cosima Wagner, 1837–1930, was the daughter of Liszt and the comtesse d'Agoult. From 1857 to 1870 she was the wife of Hans von Bülow. In 1870 she married Wagner. After his death she was largely responsible for the continuing fame of the Bayreuth festivals.
Their son, Siegfried Wagner, 1869–1930, composed 11 operas, orchestral and chamber music, and some vocal pieces, but was known chiefly as a conductor. With his wife, Winifred Williams Klindworth, he directed the Bayreuth festivals, a tradition carried on by their sons Wieland and Wolfgang from 1951 until 2008 (jointly until Wieland's death in 1967) and Wolfgang's daughters, Eva Wagner-Pasquier and Katharina Wagner, from 2008.