broader and gender-neutral, not limited to a sister
文法句型
my/his/her + stepsister
be/become + someone's stepsister
用法筆記
Usually refers to a sister relationship created after a parent's remarriage or new partnership. Distinguish from 'half-sister', who shares one biological parent with you.
常見錯誤
Nina is my stepsister because we have the same dad.
Nina is my half-sister because we have the same dad.
a stepsister is related through a parent's marriage, not through a shared biological parent.