If the loan (which your mom acted as guarantor) and the mortgage loan for the HDB flat from the same bank? If yes, the bank may lump the two loans together. If they are two separate banks than the it's unlikely the bank that sue your mom for bankruptcy can force you to sell the flat. The most it it do is put a charge on your HDB flat, that is if you sell the flat the bank must give approval, but the bank that gave the mortgage loan is unlikely to approve since it has priority on the HDB flat. In any case, as long as your mom is an undischarged bankrupt than the sell of the flat must first be approved by the OA. Try to get your mom to get the OA to help to arrange a payment plan with bank for some monthly payment and stick to payment plan as after a certain number of years your mom can apply to the OA to be discharged from bankruptcy even if there's a balance on the unpaid amount. This way, when your circumstances change in the future you are free to sell the flat without hindrance. Best to seek legal advice from a lawyer that has experience in such matters.