*I did not conduct data analyses for this project, but please email me at firstname.lastname@example.org to request access to data/syntax files and I will contact my co-author. **Citation:** Aizpitarte, A., Atherton, O.E., & Robins, R.W. (2017). The co-development of relational aggression and disruptive behavior symptoms from late childhood through adolescence. *Clinical Psychological Science*, 5(5), 866-873.