The found kitten does not want to be alone and does not let the foster sister go to her mother

The found kitten does not want to be alone and does not let the foster sister go to her mother. Kitten Lucky has already shown us many times how much he wants to live. His mother cat left him to die, but we found a kitten and our cat Kira is now feeding him. Mother cat probably wonders why the kittens are so different. But she gave birth to only one kitten. The rest of the kittens are adopted.