Why are there two now dad cat meets adopted kitten, mom cat explains to him who it is

Daddy cat knows that he had one kitten. But the mother cat adopted a kitten who was left without a mom. Mama cat brought dad cat to meet this kitten and explain to him who he is. Golden cats family, momcat, dadcat, newbornkitten The cat wears her newborn kittens The birth of a golden kitten. The cat became a mother for the first time Momcat carries a kitten to dadcat and calls him for the first meeting with her daughter