Legal analysis: the owner of the house can sell the house even if he becomes a vegetable. First, their close relatives need to apply to the people's court where the property owner is located to declare the property owner as a person without civil capacity. The court needs to hear the case. After a month's trial, he declared that the property owner was a person without civil capacity, and he would appoint a person as the guardian of the property owner according to the application of his close relatives, so that the property owner could realize the sale of the house.

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

Article 23 The guardian of a person without or with limited capacity for civil conduct is his legal representative.

Article 24 If an adult is unable to identify or fully identify his/her own behavior, his/her interested parties or relevant organizations may apply to the people's court to identify the adult as a person with no or limited capacity for civil conduct. If a person is recognized by the people's court as a person without or with limited capacity for civil conduct, the people's court may, upon the application of himself, an interested party or a relevant organization, recognize the adult as a person with limited capacity for civil conduct or a person with full capacity for civil conduct according to his mental and psychological health recovery. The relevant organizations mentioned in this article include: residents' committees, villagers' committees, schools, medical institutions, women's federations, disabled persons' federations, organizations for the elderly established according to law, and civil affairs departments.