“We propose that a coparenting relationship exists when at least two individuals are expected by mutual agreement or societal norms to have conjoint responsibility for a particular child’s well-being.  Using this definition, coparenting is a viable dimension in married, never-married, and divorced couples regardless of the couple’s sexual orientation and whether the child is biologically linked to his/her caregivers” (Van Egeren & Hawkins, 2004, p. 166).

Van Egeren, L.A., & Hawkins, D.P.  (2004).  Coming to terms with Coparenting: Implications of definition and measurement.  Journal of Adult Development 11(3), 165-178.