Sisters: Willowkit and Minnowkit
Mate: Graystripe (formerly)
Silverstream is a sleek, slender, light silver-gray and black tabby she-cat with a finely shaped head, soft, thick, glossy fur, long claws, and bright blue eyes
Silverkit is born to Willowbreeze and Crookedstar along with her littermates, Willowkit and Minnowkit. Soon after her birth, her mother and both her sisters catch greencough, and lose their lives to it, making Silverkit the only survivor of her litter. She is then taken care of by Sunfish. Her father, Crookedstar, is shaken by their deaths and tries to avoid Silverkit at first, as he doesn't want to lose her like his mate and other daughters. Crookedstar hears her playing with Vixenkit and her other Clanmates and later Oakheart insists that Crookedstar should be more fatherly and tells him he is acting like Rainflower when she ignored Crookedstar after he had fallen and gotten his crooked jaw. They get in a fight, which frightens Silverkit. Her father sees her like this and calms her down, assuring her that the fight was not for real. He then formally introduces himself to Silverkit.
In the manga after the book, she is now a warrior with the name of Silverstream. She is seen sneaking off to see a ThunderClanwarrior, Graystripe. Crookedstar tells her he doesn't want her going out of camp alone, and she reluctantly agrees and returns to camp. When he sees her with Graystripe, Crookedstar confronts her about it. Silverstream tells him that he is obsessed with Clan loyalty, and that if her relationship with Graystripe is against the Warrior Code, then the code should be changed. She tells him that even though she loves her father very much, he needs to let her choose her own future.
Crookedstar sees her in a dream, at the border between StarClanand the Dark Forest. Silverstream tells him to take care of her kits and walks into StarClan. Mapleshade meets him and is satisfied that she has taken everybody that he loves - which isn't true, because Silverstream's kits are still alive - but Crookedstar coolly replies that now everybody he loves is protected in StarClan. When Crookedstar wakes up, another RiverClan warrior tells him Mistyfoot had bad news about Silverstream.
While watching Stormkit and Featherkit playing, Crookedstar thinks to himself that she lives on in them. When Crookedstar goes to join StarClan, Silverstream is seen with her mother, Willowbreeze, and her father's friends and family.