This multi-sample study tested bidirectional within-family associations between parental sup-port and adolescents’ depressive symptoms on varying measurement intervals: Daily (N = 244, Mage = 13.8, 38% male), two-weekly (N=256, Mage=14.5, 29% male), three-monthly (N=245, Mage=13.9, 38% males), annual (N=1,664, Mage=11.1, 51% male), and biennial (N=502, Mage=13.8, 48% male). Pre-registered random-intercept cross-lagged panel models (RI-CLPM) showed negative between- and within-family correlations. Although no within-family lagged effects were found from parental support to depressive symptoms at any time interval, de-pressive symptoms predicted decreased parental support two weeks and three months later. Effects were moderated by adolescents’ sex and neuroticism. Findings mainly supported ado-lescent-driven effects, and illustrate that within-family lagged effects may not generalize across timescales.