Upstairs, the bathroom next door leaked, leaked upstairs, and leaked to my house, who should I sue

If it can be resolved through negotiation, then directly find the person responsible for the source, if not, go through the legal procedure, then list all of the above as defendants.

If it's a leaky toilet leak! It should be a problem upstairs, and it should be negotiated with the upstairs neighbors! Just let the leaky neighbor redo the waterproofing! Hope it helps!

The owner of the upstairs pays to make up for the leakage and the ceiling downstairs. No need to reach the floor.

It is reasonable to be upstairs responsible. Negotiate with the other party, if it is fruitless, find the property or the family committee to intervene to help mediate and persuade the other party to compensate, if it is useless, you can only go to court to sue him.

The ground must be treated from upstairs, and if his pipe is blocked, he must also come to you to open the inspection opening to unclog the same reason. He doesn't cooperate, you can only plug his tube. >>>More