Let’s look at how to some common names when describing different family members.

Words

엄마 - mom ( Noun )

아빠 - dad ( Noun )

새엄마 - stepmother ( Noun )

새아빠 - stepfather ( Noun )

계모 - stepmother (negative connotation) ( Noun )

계부 - stepfather ( Noun )

이복동생 - young stepbrother ( Noun )

이복형제 - stepbrothers ( Noun )

이복자매 - stepsisters ( Noun )

이복남매 - stepbrothers and stepsisters ( Noun )

Phrases

링컨의 새엄마는 정말 좋은 사람이었대 - Lincoln's step mother was a really nice person. ( Informal casual )