The upstairs toilet leaked and flowed into our house, who is responsible?

First of all, when you go to his house, it should be called a discussion or a theory, not a complaint.

Complaints are generally directed to the relevant authorities.

You should do the following:

1. Immediately take photos from multiple angles, and take pictures of the water leakage point, the situation during the water leakage, and the damage after the water leakage.

2. Find the property management company in your community and the members of the owners' committee or the relevant personnel of the neighborhood committee to coordinate.

3. If their toilet has not been renovated, and there is no obvious damage or damage to the surface, then the property and development company is responsible for repairing.

4. If their toilet has been renovated, then the property maintenance staff will help find the leakage point, and if it is the renovated water and sewage pipes, their home is responsible for repairing. If it's a pipe in a common area, it's the property and development company that is responsible for the repairs.

5. If they do not agree to the repair, or even do not agree to inspect the property, the owners' committee, and the neighborhood committee, you can only go to the court to sue him. At this time, the photos you have taken, the minutes of the meetings you have coordinated, the text messages, etc., are all physical evidence. The facilitator is the witness.

It should be that there is a problem with the waterproof layer upstairs, and you can find someone from the property to come and coordinate with you, and find out who made the waterproofing and who is responsible for repairing it.

You should have to pay some money to fix it...

You can ask the property owner to coordinate the solution.

His family is not harmed, he will definitely not pay attention to it, it depends on how you discuss it with him.