This video is from George BC’s YouTube channel. He writes:
I tried to introduce the two new little kittens to our big kitten. The big kitten was surprised to see the new two cute kittens in her territory and she was little bit suspicious about the new comers. She was territorial like any other cat and was not willing to accept the new cats in her area. The new kittens were afraid of the big cat too, thinking that she was their enemy trying to attack them. In the initial days the cats acknowledged each other with hisses and growls whenever they met face to face.