This article summarizes two decades of research about family, and especiall
y parental, influences on the risk of adolescents becoming pregnant or caus
ing a pregnancy. Research findings are most consistent that parent/child cl
oseness or connectedness, parental supervision or regulation of children's
activities, and parents' values against teen intercourse (or unprotected in
tercourse) decrease the risk of adolescent pregnancy. Largely because of me
thodological complexities, research results about parent/child sexual commu
nication and adolescent pregnancy risk are very inconsistent. Residing in d
isorganized/dangerous neighborhoods and in a lower SES family, living with
a single parent, having older sexually active siblings or pregnant/parentin
g teenage sisters, and being a victim of sexual abuse all place teens at el
evated risk of adolescent pregnancy. Several biological factors (timing of
pubertal development, hormone levels, and genes) also are related to adoles
cent pregnancy risk because of their association with adolescent sexual int
ercourse. (C) 2001 Academic Press.