1 Chronicles 27:18

Of Judah, Elihu, one of the brethren of David: of Issachar, Omri the son of Michael:

Cross-reference

1 Chronicles 2:13 lists David's brothers including Eliab the firstborn, giving the full genealogy of the family.

2 Chronicles 11:18 mentions Eliab as father of Abihail, another reference to David's brother.