Legal analysis: two sisters can handle it together or entrust one person to handle it. 1. Two sisters can buy a house and repay the loan together; 2. The bank should sign a repayment commitment letter at the same time as signing a loan contract; 3. Both people must have a tax bill or social security for more than one year; There is no problem when the income certificates of two people add up.

Legal basis: Article 4 of the Interim Measures for the Administration of Listing and Sales of Purchased Public Housing and Economically Affordable Housing, with the approval of the people's governments of provinces, autonomous regions and municipalities directly under the Central Government, cities and counties that meet the following conditions may open the market for sale of purchased public housing and economically affordable housing: (1) The housing situation of urban workers' families has been investigated by means of personal declaration, and the unit has audited and registered, and the applicants who have violated the law and discipline in the housing system reform have been dealt with. (2) Measures for the management of income distribution of purchased public housing and affordable housing have been formulated; (3) Specific implementation measures for purchasing public housing and selling affordable housing have been formulated; (4) Other conditions stipulated by laws and regulations.