The Erso lineage comprised human individuals whose activities spanned from the era preceding the Clone Wars through the Battle of Scarif. They inhabited various planets, notably Grange, Coruscant, and Lah'mu. The family's initial members consisted of a human male and a female, who together parented Galen Walton Erso. Galen, in turn, with his spouse Lyra, had a daughter whom they named Jyn.
Following Orson Callan Krennic's capture of Galen for the Galactic Empire, to force his work on the Death Star project under the Imperial Military Department of Advanced Weapons Research, Lyra met her demise. Subsequently, Jyn went into hiding, finding refuge with Saw Gerrera, the leader of the Partisans. Ultimately, Jyn gave her life on Scarif in the act of procuring the Death Star plans for delivery to the Alliance to Restore the Republic. She was then killed by the superweapon of the Death Star. As Jyn did not have any children, her passing marked the end of the Erso family line.