Washington, D.C., Johnson has an older sister
Lynda Bird. Johnson's first name was originally spelled "Lucy"; she changed the spelling in her teens as a rebellion towards her parents. As her parents both had the initials LBJ, they named their two daughters to have these initials also.
 Although her father was a member of the
Christian Church (Disciples of Christ), her mother was an
Episcopalian, and she and her older sister,
Lynda Bird, were raised as Episcopalians. Johnson converted to
Roman Catholicism at the age of eighteen, when she requested and received
 Johnson had been baptized with water and in the name of the
Trinity at five months old by an Episcopal priest in Austin, Texas. Her rebaptism caused protests from leading figures in the Episcopal Church, which made headlines, as the Roman Catholic teaching does not require converts who are already baptized to receive baptism a second time.
She was sixteen when President
John F. Kennedy was
assassinated in Dallas on November 22, 1963. Johnson heard of the assassination while attending a Spanish class at the
National Cathedral School. She was unaware if her father had been injured as well but realized he had been sworn in as the 36th President of the United States when
Secret Service agents showed up on her school campus a few hours later.
 She later attended
Georgetown University School of Nursing and Health Studies but dropped out in 1966 as the school prohibited married students (Johnson married her first husband in August 1966).