Is it a disadvantage for a daughter and son-in-law to share a bed at home?

It is unfavorable to say that daughters and son-in-law share the same bed at their parents' home. In ancient China, it was said that it would bring bad luck for a daughter to go back to her mother's house and share a room with her son-in-law. Maiden's family is a Chinese word, and some dialects are called maiden's family, which generally refers to the home of a married woman's own parents. This answer is for reference only. Don't be blindly superstitious.