'Flesh and Blood' in the Bible

So all the tribes of Israel came to David at Hebron, and they said, "Here we [are], {we are your flesh and blood}.

Then David said to Abishai and all his servants, “Look, my own son, my own flesh and blood, intends to take my life—how much more now this Benjaminite! Leave him alone and let him curse me; the Lord has told him to.

You are my brothers, my flesh and blood. So why should you be the last to restore the king?’

And tell Amasa, ‘Aren’t you my flesh and blood? May God punish me and do so severely if you don’t become commander of the army from now on instead of Joab!’”