The activation relationship is an emotional bond between caregiver and child that encourages child openness to the world through stimulation and discipline. This study aimed to analyse the father-child activation relationship in the Brazilian context through the Risky Situation. Twelve dyads have been observed: six father-boy and six father-girl dyads at preschool age. The results showed greater activation of boys compared to girls. Such results are analysed according to the Activation Relationship Theory. Despite sample size limitation, results consistently support the findings of other studies conducted in other contexts.