Police in China can do whatever they want after 81 days in arbitrary detention you clearly realise that they don't have to obey their own laws. In a society like this there is no negotiation no discussion except to tell you that power can crush you any time they want - not only you your whole family and all people like you.
You can tell your uncle stuff that you could not tell your dad. That is kind of the role of an uncle. I feel very much like a father sometimes but sometimes I feel like a teammate.