By what name was Liberace known as by his family?

Władziu Valentino Liberace (May 16, 1919 – February 4, 1987), mononymously known as Liberace, was an American pianist, singer, and actor. A child prodigy and the son of working-class immigrants, Liberace enjoyed a career spanning four decades of concerts, recordings, television, motion pictures, and endorsements. At the height of his fame, from the 1950s to the 1970s, Liberace was the highest-paid entertainer in the world, with established residencies in Las Vegas, and an international touring schedule. Liberace embraced a lifestyle of flamboyant excess both on and off stage, acquiring the sobriquet "Mr. Showmanship".

Liberace (known as "Lee" to his friends and "Walter" to family) was born in West Allis, Wisconsin. His father, Salvatore ("Sam") Liberace (December 9, 1885 – April 1, 1977), was an immigrant from Formia, Italy. His mother, Frances Zuchowska (August 31, 1892 – November 1, 1980), was of Polish descent. Liberace was born with a caul, which in some cultures is considered indicative of genius, good luck, or the promise of a prosperous future. He had a twin, who died at birth.