Stepbrother vs. Stepsister

Stepbrothernoun

The son of one's stepparent who is not the son of either of one's biological parents.

Stepbrothernoun

The stepson of one's parent who is not one's half-brother.

Stepbrothernoun

A brother by the marriage of one's father with the mother of another, or of one's mother with the father of another.

Stepbrothernoun

a son of your stepparent by a former marriage

Stepsisternoun

The daughter of one's stepparent who is not the daughter of either of one's parents.

Stepsisternoun

The stepdaughter of one's parent which is not one's half-sister.

Stepsisternoun

A daughter of one's stepfather or stepmother by a former marriage.

Stepsisternoun

a sister who has only one parent in common with you