" It’s not his last life,” she rasped, “and even if it were, I couldn’t kill him.” “Why not? StarClan would honor you for it.” Fireheart could not believe her words. The name Brokenstar had always made this old she-cat bristle with rage. Yellowfang dragged her gaze from Brokenstar and looked at Fireheart. Her eyes clouded with pain and grief as she murmured, “He is my son. "

― Erin Hunter , Fire and Ice (Warriors, #2)