The primary goal of the present study is to examine relations between maternal emotion regulation (ER) and emotion parenting behaviors and child ER. The present study is novel in its investigation of the link between maternal ER and emotion parenting behaviors. Further, this study adds a unique contribution to the literature in its multi-method assessment of maternal ER (i.e., self-report, semi-structured interview). Participants included 64 maternal caregiver-child (8-11 years old) dyads. Participants completed self-report questionnaires and engaged in a conflict discussion task. Maternal caregiver and child ER was coded from the behavioral observations. Results revealed that unsupportive emotion parenting behaviors were negatively related to adaptive maternal ER and positively related to maternal emotion dysregulation. Further maternal ER and emotion parenting behaviors related to child ER. Unsupportive emotion parenting behaviors were found to significantly mediate the link between maternal and child ER. Basic research and applied implications are discussed.