Ethan's siblings

Pokémon Wolf Stories Ova 1
They are Ethan's four older siblings. One of which is female, the other three male. When Takeda Gohei visit their home, he looked over each pup (ignoring Ethan) to take with him to train. He takes only one and leaves the rest with Yamabuki. No one knows if any of Ethan's siblings are alive or not. They rather been adopted or deceased.