Father of peace.
Absalom .
Tamar's brother was Absalom
King David said this after the death of Absalom in battle.
I don't think they were named in the Bible and Absalom did not seem to know them, the way he blatantly took his father's concubines. (2Samuel 16.22)
2 Samuel, chapters 13 to 18.
his long hair got caught in a tree and he died
There were several men in the Bible who had long hair, Samson was one, but possibly you are searching for Absalom, who was one of King David's sons. The bible records that at Absalom's annual haircut, approximately five pounds of hair would be removed. Absalom rebelled against his father David and took the kingdom for a very short period of time. David's troops revived and as Absalom was escaping he was riding a fast mule in the woods when his hair got tangled in some tree branches, which left him dangling there. Joab, David's commander found Absalom and thrust him through with three spears and if that was not enough ten of Joab's armor bearers surrounded him and finished him off. You can find the story of Absalom's death in II Samuel 18:
Sydney Absalom Temple has written: 'A serpent in Eden, and other stories from the Book' -- subject(s): Bible, Criticism, interpretation
Absalom's children are not mentioned in the Bible after Absalom's own death. It is likely that they either died young or were not significant enough to be recorded in historical accounts.
Adonijah Absalom
Absalom (2 Samuel 18:33)