Interviewing your stepbrother could easily eliminate him from the persons-of-interest list altogether.

This man in the hotel dining room could not be his stepbrother.

The stepbrother and James had not been on terms of effusive cordiality.

Fenneben's only a stepbrother and the West made a man of him.

The woman was Mary Giancana, Mooney's stepmother, and Charley was his stepbrother.