Father and son chronic illnesses.

For chronic illnesses affecting family members like your father and son, HDB may approve selling your flat before the Minimum Occupation Period (MOP) under exceptional circumstances, particularly if the owner or family needs to move to provide/receive necessary care.

Key conditions include:
- The illness must be severe/chronic, supported by medical certificates from registered doctors or hospitals.
- You need to demonstrate why staying in the current HDB flat is no longer feasible (e.g., lack of caregiving support, accessibility issues).
- The family must show intent to buy/rent a more suitable property (e.g., near medical facilities or with better accessibility).

Submit an appeal via HDB's e-Service with:
- Medical reports detailing the chronic conditions.
- Proof of family relationship (e.g., birth certificates, ICs).
- Financial documents if hardship is involved.

HDB assesses on a case-by-case basis; approval isn't guaranteed but is more likely for genuine medical needs. Check EdgeProp Singapore for related HDB resale listings and trends while your appeal is processed.