'Half brothers' in the Bible

After this incident, Jesus, His mother, His [half-] brothers and His disciples went down to Capernaum [i.e., located on the north shore of Lake Galilee] and stayed there a few days.

Then Jesus' [half-] brothers said to Him, "You should leave here and go to Judea so your disciples [there] can see the [supernatural] deeds you are performing.

For even Jesus' [half-] brothers did not believe in Him [i.e., at that time].

But after His [half-] brothers had gone up to the Festival, Jesus also went up, but secretly instead of openly.