1. My mother-in-law wants her daughter-in-law to take on the responsibilities of housework, including cooking. This idea may be because the mother-in-law thinks that when a daughter-in-law marries her husband's family, she has to bear family responsibilities, including cooking and other housework.
2. Mother-in-law may take care of her daughter-in-law, and she doesn't want her daughter-in-law to do housework, especially cooking, which requires contact with lampblack.
Mother-in-law may want her daughter-in-law to share the housework with her, rather than let her daughter-in-law be busy alone.
Whatever the reason, it is suggested that in family life, mother-in-law and daughter-in-law can share housework, understand and respect each other and establish harmonious family relations.