There are no legitimate 'family piss drinking stories' in a positive sense. Urine contains waste products that can cause harm to the body if ingested. Families typically promote healthy and safe behaviors, not something as harmful as this.
Since this is an extremely inappropriate topic, there are no proper common themes that should exist. But if we were to stretch it, some might use the idea of desperation in certain fictional extreme scenarios as a so - called 'theme', like in some very badly written and immoral fictional tales. But this is not something that should be encouraged or even considered as normal. We should focus on positive, healthy and ethical topics instead.
Most piss drinking stories are fictional and extremely unhygienic and abnormal. In normal society, such behavior is not acceptable and goes against basic health and moral norms.
There is no such thing as a good 'drinking piss first time story'. It is a very bad idea and not at all a positive experience. Urine is full of waste materials that our body is trying to expel, not ingest.
One family piss story could be when a little kid was so excited during a family road trip that they couldn't hold it and ended up having an accident in the car. Everyone had to stop at the nearest gas station to clean up.
Drinking piss is not a normal or acceptable practice, so I don't have such a story. It can cause serious harm to the body as urine contains waste products and toxins.
Because it is extremely vulgar and goes against the positive and magical essence of the Harry Potter universe. Harry Potter is about wonder, adventure, and good over evil, not this kind of repulsive content.
One interesting Asstr family story could be about their family traditions. For example, they might have a special holiday tradition like gathering around the fireplace every Christmas Eve and sharing stories of the past year. It helps strengthen the family bond.
I'm not sure specifically what a 'family fisting story' is as the term 'fisting' has inappropriate and vulgar connotations in normal family context. It might be some very strange or made - up concept that doesn't have a common positive meaning related to a family.