This randomized controlled trial explored the effects of parental reminiscing training on preschoolers' memory and metacognition among French-speaking White parents and their typically developing children (24 females, 20 males; M[subscript months] = 49.64) in Belgium. Participants were assigned, with age stratification, to the immediate intervention (n = 23) or waiting-list group (n = 21). The assessments were conducted by blind evaluators before the intervention, immediately after, and 6 months later. Resulting specifically from the intervention, parents sustainably improved their reminiscing style (e.g., greater provision of feedback and use of metamemory comments). The effects of the intervention on children's outcomes were, however, less clear. Based on the social-constructivist approach, such effects could be expected to occur later.