co-parent
US /ˌkoʊˈper.ənt/
UK /ˌkoʊˈper.ənt/

1.
to share the duties of raising a child with another person, especially after separation or divorce
:
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Despite their divorce, they successfully co-parent their two children.
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It's important for separated parents to learn how to effectively co-parent.
1.
a parent who shares the duties of raising a child with another person, especially after separation or divorce
:
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She is a dedicated co-parent, always putting her children's needs first.
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The agreement outlines the responsibilities of each co-parent.