FAMILY CODE SECTION 3900-3902
3900. Subject to this division, the father and mother of a minor
child have an equal responsibility to support their child in the
manner suitable to the child’s circumstances.
3901. (a) The duty of support imposed by Section 3900 continues as
to an unmarried child who has attained the age of 18 years, is a
full-time high school student, and who is not self-supporting, until
the time the child completes the 12th grade or attains the age of 19
years, whichever occurs first.
(b) Nothing in this section limits a parent’s ability to agree to
provide additional support or the court’s power to inquire whether an
agreement to provide additional support has been made.
3902. The court may direct that an allowance be made to the parent
of a child for whom support may be ordered out of the child’s
property for the child’s past or future support, on conditions that
are proper, if the direction is for the child’s benefit.