Your son bought a real estate after marriage, and you participated in the mortgage repayment and down payment, so ~ you should have the corresponding repayment bank flow certificate or transfer certificate, which can prove your capital contribution, so that even that part is your personal property donated to your son. The down payment and loan paid by your son belong to the property after marriage, and he and his daughter-in-law are half rights and interests! Including the rights and interests of the value-added part of the property since buying a house, excluding your share of the money, he and his wife are also half-home! These are detailed in the new marriage law. If your son is divorced, your son needs to pay his daughter-in-law half of the total loan, half of the down payment and half of the value-added part of the house. The outstanding loan belongs to your son's personal debt.