The two are different from Gin, they are not as rare as their brother.
Ginga: Nagareboshi Gin
They were born with Gin to Riki and Fuji. They were denied as good bearhounds and were left to live with their mother Fuji.
When Gin finishes his training with Gohei, he returns home for a brief time. The differences are already obvious when he flips one of them over.
After Gin easily jumps on the roof, his siblings try to do the same but fail.
Ginga Densetsu Anju to Jirōmaru
Neither of the siblings makes an appearance but it's mentioned that one of them is the parent of Yuki. It's unknown which one but it is most likely the white one.
Ginga: The Last Wars
Neither of the siblings makes an appearance but Shion mentioned that he is grandson of one of Gin's siblings and his mother, Kinumaru is daughter of one of Gin's siblings and could be Yuki's sister or cousin, it's unknown which but it is most likely Giyan (the withe one).
- The red one is known as Hiya-n/Hiyan and the white one is known as Giyan by some fans. These aren't their real names; they're just whimpering sounds the pups made when Gohē hits them with his cane (hyaan and gyan). These names are not official in any way.
- The red one's forehead dots are a slightly different color from his underfur in the anime.
- The white one is the one most likely to be the father of Yuki and Kinumaru, since he is the same color as them.
- Neither have a major role in the series, and they only appear in the first few chapters/episodes.