Which was not a son of David who sought to take the royal throne Adonijah Absalom Amnon Abner?

Abner was not a son of David who sought to take the royal throne. He was actually a military commander in Saul's army and later supported Ish-bosheth, Saul's son, as king after Saul's death. In contrast, Adonijah, Absalom, and Amnon were all sons of David who attempted to claim the throne during their lifetimes.