Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Journalist John O'Mahony called Shepard's trilogy "arguably his greatest achievement." Some critics consider the three plays part of a quintet which also includes Fool for Love (1983) and A Lie of the Mind (1985).
References
Simard, Rodney. “American Gothic: Sam Shepard's Family Trilogy.” Theatre Annual 41 (1986): 21-36.