Stepbrother and Sib

Stepbrother noun - A brother who has only one parent in common with you.

Sib and stepbrother are semantically related in relative topic. In some cases you can use "Sib" instead a noun "Stepbrother", when it comes to topics like member of a family.

Sib noun - One related by blood or origin; especially on sharing an ancestor with another.

Stepbrother and sib are semantically related in relative topic. You can use "Stepbrother" instead a noun "Sib", if it concerns topics such as member of a family.