half brother

step-brother, brother through one parent only

One's sibling is one's brother or sister, respectively meaning a male or female with whom one shares at least one parent. This is usually taken to mean that the two people are genetically very close, though it is not always necessarily the case, for example one or more siblings may have been adopted by their parents.
See more at Wikipedia.org...

Noun
1. a son of your stepparent by a former marriage
(synonym) stepbrother
(hypernym) brother, blood brother

(n.)
A brother by one parent, but not by both.
  

n.
سوتيلا بھائي