Using the study of comparative writing styles (palaeography), most of the manuscripts in the family (with the exception of Minuscule 69) appear to have been written by scribes trained in Southern Italy.
Before his death, Ferrar collated four minuscules (Greek handwritten cursive texts) to definitively demonstrate that they all shared a common origin.
In 1913, textual critic Hermann von Soden’s work on the Greek New Testament seemed to confirm the assertion this family descended from a common archetype.
By 1941, biblical scholar and textual critic Kirsopp and his wife Silva Lake turned their attention to this important family of manuscripts.
In 1961, Jacob Geerlings published three monographs (Matthew, Luke, and John) on the family, although some scholars regard this work as flawed by serious methodological problems.
Research recently completed using phylogenetic software by Dr. Jac Perrin (through the auspices of ITSEE - Institute for Textual Scholarship and Electronic Editing at the University of Birmingham, UK) agrees with the conclusions of the Münster team that although the Albanian manuscripts 1141 and 2900 both contain some F13 readings, neither meet the full criteria of F13 membership.
A press release from CSNTM in March 2008 reported that "one or two" of these previously unstudied manuscripts may also belong to family 13; in which case they would be the earliest surviving witnesses to this text.