Conversation so far:
Who was Johnny Cash's first wife?
Johnny Cash's first wife was Vivian Liberto.
Where did Johnny Cash and his first wife, Vivian Liberto meet?
Johnny Cash met 17-year-old Italian-American Vivian Liberto at a roller skating rink in her native San Antonio
Where did Johnny Cash and Vivian Liberto meet?
Johnny Cash met 17-year-old Italian-American Vivian Liberto at a roller skating rink in her native San Antonio
What happened before Johnny Cash's and Vivian Liberto's marriage?
Before marrying Vivian Liberto, Johnny Cash was deployed to Germany for a three-year tour.
How did Johnny Cash and Vivian Liberto stay in contact while Cash was deployed in Germany?
During Johnny Cash's deployment, the couple exchanged hundreds of pages of love letters.
What happened between Johnny Cash and Vivian Liberto after Cash's discharge?
On August 7, 1954, one month after Johnny Cash's discharge, Cash and Vivian Liberto were married at St. Ann's Roman Catholic Church
Where were Johnny Cash and Vivian Liberto married?
Johnny Cash and Vivian Liberto were married at St. Ann's Roman Catholic Church in San Antonio.
What made Johnny Cash's and Vivian Liberto's marriage ceremony so special?
Johnny Cash's and Vivian Liberto's marraige ceremony was performed by Vivian's uncle, Vincent Liberto.

Question: How many children did they have
Self-contained rewrite: How many children did Johnny Cash and Vivian Liberto have?