Legal analysis: if there is no family loss, it means that the real estate license is invalid, so it cannot be sold. Property ownership certificate is a certificate that buyers can obtain the legal ownership of houses through transactions and exercise the rights of possession, use, income and disposal of purchased houses according to law.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 209 The establishment, alteration, transfer and extinction of the real right of immovable property shall take effect after being registered according to law; Without registration, it will not take effect, except as otherwise provided by law. Natural resources owned by the state according to law may not be registered.

Article 210 The registration of immovable property shall be handled by the registration institution where the immovable property is located.

The state implements a unified registration system for real estate. The scope, organization and method of unified registration shall be stipulated by laws and administrative regulations.