Jude is also believed to be the brother of James the Less, who is thought to also be the same James that was the brother of Jesus. Thus Jude may also be one of Jesus' brothers in addition to being His follower.
The Epistle of Jude in the New Testament is attributed to St. Jude. It is a short letter reminding believers to be vigilant and virtuous and beware of the ungodly in their midst.