In this way, will the two parties show that they are married when they sign their daughter-in-law's account?

Hello, I'm glad to answer your question. It won't show. At present, the information of the marriage registration office (civil affairs department) and the household registration system of the police station is not shared. Therefore, the household registration information will not be automatically updated on the premise that the parties have not moved their household registration or applied to change their household registration information. The parties may bring their ID cards, household registration books, marriage certificates, etc. And consult the staff of the police station in the jurisdiction where the household registration is located, subject to the other party's reply. 《