Stepdaughter vs. Stepfather — What's the Difference?

A spouse's daughter by a previous union.

A stepfather or stepdad is a non-biological male parent married to one's preexisting parent. A stepfather-in-law is a stepfather of one's spouse.

The daughter of one's spouse and not of oneself.

A man who is a stepparent.

A daughter of one's wife or husband by a former marriage.

(in the narrow sense) A husband of one's biological mother after her initial marriage to or relationship with one's biological father.

A daughter of your spouse by a former marriage

(in the broad sense) A husband of one's parent distinct from one's biological father

The husband of one's mother by a subsequent marriage.

The husband of your mother by a subsequent marriage