...your wife apologizes every time she buys soda and juice boxes for the kids and their friends because it takes up room in the beer fridge.
... your sister asks "why do you dress the fermenters?". Then you have to explain why you stole the kid's painting shirts so you can keep light out of your beer. Any answer to this question is met with shock and a look of disgust.
... you no longer invite you sister to your house.
... Half of the conversation with the Culligan water softener sales guy is about how the system will affect your brewing water and you know more about water chemistry than he does.
and number one for me, at least, you tell guests you're sorry that you only have 3 on tap this week because life got in the way of your brewing schedule.
Paul