“…First, there is a high degree of co-occurrence between physical and relational aggression, suggesting that children who exhibit one form of aggression likely exhibit the other form of aggression as well (Little, Jones, Henrich, & Hawley, 2003). Children in foster care display higher levels of physical aggression, so they likely display higher levels of relational aggression as well (Clausen, Landsverk, Ganger, Chadwick, & Litrownik, 1998; Tarren-Sweeny, 2008). Second, research on attachment theory and relational aggression suggests that children who have attachment styles other than secure attachment with their caregiver are more likely to display relational aggression within their peer relationships (Casas et al, 2006; Michiels, Grietens, Onghena, & Kuppens, 2008).…”