This mixed method study explored whether and how familial mentor support may have influenced the parent-adolescent relationship, and whether the impact of familial mentor support on the parent-adolescent relationship may have differed across adolescents' developmental stage. Findings from analyses of survey data from 106 Black adolescents indicated that familial mentor support may be equally beneficial for youths' connectedness to parents across developmental stage. Interview data from a subset of 12 adolescents, their primary caregivers, and familial mentors were analyzed to better understand how familial mentors supported the parent-adolescent bond and whether the nature of mentor support differed between early and middle adolescents. Qualitative findings indicated that mentors supported the parent-adolescent relationship by acting as sounding boards; coaching positive communication strategies; and promoting understanding between youth and their parents. Additionally, findings indicated that familial mentors may be attuned to developmental changes experienced by their adolescent relatives.