His sister used his ID card to buy a house for three years without paying the property fee, and was also sued. Does it affect him?

Of course it does. There will be three consequences: 1, the risk of default, and the owner will bear the responsibility for breach of contract; 2, litigation risk, the property company filed a lawsuit in court, and the owner will bear the risk of losing the case; 3. The risk of service decline will lead to the decline of property services and affect the living experience of the owners.

Legal basis: The owner of the Property Management Regulations shall pay the property service fee according to the agreement in the property service contract. Violation of the property service contract, overdue payment or refusal to pay the property service fee without justifiable reasons, the owners' committee has the right to urge them to pay within a time limit; If it fails to pay within the time limit, the property management enterprise may bring a lawsuit to the people's court.