stepparent

US /ˈstepˌper.ənt/
UK /ˈstepˌper.ənt/
"stepparent" picture
1.

a parent who is not a person's biological or adoptive parent but is married to one of their parents

:
Her stepparent has been very supportive since her father remarried.
It can be challenging for children to adjust to a new stepparent.