'Half brother' in the Bible

[Upon entering the house] he held up his hand to quiet them, then went on to explain how the Lord had rescued him from jail. He said to them, "[Go] tell all this to James [the Lord's half-brother] and to [the rest of] the brothers." Then he left [them] and went elsewhere.

Then, after they finished speaking, James [the Lord's half-brother, See 12:17] spoke up and said, "Brothers, listen to me.

The next day Paul went with us to visit James [the Lord's half-brother and a leader in the Jerusalem church], with all of the elders [of the Jerusalem church] being present.