Robert, Edna, Roger, and Irene Strickland in 1914.
The Strickland family was a prominent family in Hill Valley that mostly represented authority figures in the community. During the 1910s, the Stricklands were considered Hill Valley's "first family of the gaslight era". The known lineage began with Marshall James Strickland. His supposed son Roger was at his side whom he always taught "discipline".
Later in town history, Gerald Strickland, presumably the grandson of James Strickland, became the school superintendent at Hill Valley High School from the 1950s to the 1980s, and possibly the Dean of Hill Valley College. His parents were Roger and Irene Strickland. Gerald had two older siblings, a sister named Edna and a brother named Robert.
Another unnamed Strickland was mentioned by Verne Brown as being principal of his elementary school. It is possible that with this unnamed Strickland, and the possibility that Gerald remained Superintendent and did not go on to become the Dean of Hill Valley College, that there could be up to three Stricklands in the education profession terrorizing "slackers" by the year 1991.
In addition, Ricky Strickland was a presumed relative of the family, but his relation to Gerald or Edna is unknown.
Family tree
Marshall James Strickland |? Roger Strickland + Irene Strickland | +---------------------+--------------------+ Tannen family | | | | Gerald Strickland Robert Strickland Edna Strickland + Irving "Kid" Tannen (b. 1925) | Clay Strickland | Tannen family