Workplace family support has been regarded as a factor that helps reduce individuals' work to family conflict (WFC). How this support translates into families' functioning is still to be determined. In this study, we used a systems perspective to examine (a) how perceptions of workplace family support affect parental satisfaction and consequently reduce WFC and (b) how the perception of support affects partners' parental satisfaction and WFC in dual‐earner couples. A two‐wave dyadic data set of dual‐earner couples with preschool‐aged children (N = 90) was used, and the actor‐partner interdependence mediation model (APIMeM) was applied. Results showed that controlling for WFC, working hours, number and age of children, mothers' perceptions of workplace family support (time 1) had indirect effects, through mothers' parental satisfaction (time 1), on their own levels of WFC (time 2) as well as on their partners' levels of WFC (time 2). Fathers' perceptions of workplace family support (time 1) had a direct effect on fathers' parental satisfaction (time 1) and on fathers' WFC (time 2). These results suggest that in addition to boosting parental well‐being, perceptions of a supportive workplace may help reduce the level of WFC for both direct recipients of support and their partners, in particular when support is experienced by mothers, and when these mothers experience heightened parental satisfaction.