co-parent 
verb [with object] (often as noun co-parenting)
(Especially of a separated or unmarried couple) share the duties of bringing up (a child).Christopher A. Thurber, Ph.D. is a licensed clinical psychologist who divides his time among Phillips Exeter Academy, corporate and camp consultation, and co-parenting his infant son....
- My understanding is you and Andrew are still very close and co-parenting the girls.
- Steve and I are really committed to co-parenting our kids and we're getting along great.
noun
A person who co-parents a child.Perhaps of most importance is the recognition and treatment of fathers as full co-parents and as potential nurturers of children....
- Such integration both depends on and fosters a view of fathers as full co-parents, as nurturers as well as providers.
- Lesbian co-parents should not have to argue or justify themselves to gain information about their partner or child.
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