Quality relationships among families and teachers in early care and education (ECE) hold promise to nurture resilience among children impacted by adversity. However, little is known about how adverse childhood experiences (ACEs) may affect the interactions between families and teachers. This study uses quantitative survey data from families (N = 235) and qualitative interview data from teachers (N = 13) to examine the link between children's adversity and family-teacher relationship quality (knowledge, attitudes, practices) in ECE. Quantitative results indicate that when a child has experienced more of the ACEs conventionally studied (e.g. maltreatment, parent substance abuse or mental illness), parents are more likely to perceive lower quality practices with teachers, but when a child has experienced more ACEs on an extended measure (e.g., bullying, discrimination), parents are more likely to perceive higher quality practices with teachers. Qualitative results indicate that teachers report challenges in relationships with families when children experience trauma or adversity, but that ACEs also can present an opportunity to strengthen family-teacher relationships. Findings can inform professional development for teachers focused on strategies to work with families facing adversity, as well as policies related to program standards (e.g., family engagement) and interventions to improve family-teacher relationships quality.