My little sister's friend, Cecelia, still sleeps with her parents every night...?

She is 14 years old and she sleeps with her parents every night. Her parents refer to it as the "family bed." She has four older brothers who also did the same thing until they moved out. My sister asked how that worked? Like, do her parents ever get to be alone. She told my sister that they have practically every night and call her into the room when they're finished for her to be with them and cuddle. Is that not disgusting and creepy. The little girl doesn't even think it's the slightest bit weird. Also, her mother is always kissing her, hugging her, touching her, and holding her hand no matter where they are. At there home or in public!