From King Dictionary of Contemporary English
Related topics: Family
half-brotherˈhalf-ˌbrother ●●○ noun [countable] SSFa brother who is the son of only one of your parentshalf-sister
Examples from the Corpus
half-brotherOther characters include his half brother, two male teachers and the male head teacher.Sir Kenneth was the half brother of Osgood MacKenzie who created the famous gardens in Inverewe.The president's half brother and one of his sons sued the government for trampling on their civil rights!