Elbow sister beat her mother-in-law, which means that swing sister posted a video of beating her mother-in-law on Tik Tok. Because Elbow is a Tik Tok platform, she is a network stalk, which means swinging girls; Beating my mother-in-law means that there is a video release of beating my mother-in-law. Therefore, Elbow Sister spanked her mother-in-law, which means that Dangmei posted a video of spanking her mother-in-law on Tik Tok. Mother-in-law is a title, which is usually used to address elderly women, including her husband's mother, grandmother (grandmother), grandmother (grandmother) and great-grandmother.