Introduction: Many global studies identify the importance of parental emotion regulation (ER) and quality of parent-child attachment on children's ER ability. Such research is rare in Sri Lanka.Objective: To assess the association between parental ER difficulties, quality of parent child attachment and temperament on adolescents' ER difficulties.Method: A cross sectional study was done on 233, 12-14 year old adolescents and 349 parents accessed from a Type AB, Type C and Type 2 school and from a Christian and Buddhist Sunday school within the Colombo Educational zone using the convenient sampling method. Content and consensual validated Difficulties in ER Scale, the Inventory of Parent-Peer-Attachment-Parental subscale, the Abbreviated Dimensions of Temperament Survey-Revised were used along with a demographic questionnaire to collect data. Results: A significant positive relationship was found between mother's, father's and adolescent's ER difficulties (Mother: Pearson r (208) = 0.305, Father: Pearson r (122) =0.377). A significant negative relationship was seen between attachment towards mother and attachment towards father and adolescent's ER ability [(Mother: Spearman r (225) = -0.220, Father: Spearman r (219) = -0.233].Fathers' ER abilities had a greater impact on the adolescents' ER abilities than mother's ER abilities (Father: β=0.32, p<0.01, Mother: β=0.823, p=0.526). Similarly, father's attachment (β=-0.277, p<0.01) was seen to be more important in predicting ER ability in the adolescents than _________________________________________