single parent
US /ˈsɪŋ.ɡəl ˌper.ənt/
UK /ˈsɪŋ.ɡəl ˌper.ənt/

1.
a person who has a child or children but no husband, wife, or partner living with them
:
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Being a single parent can be challenging but rewarding.
•
Many single parents rely on government support.