Hey Pandas, What’s An Unspoken Rule That You Have In Your Family?

We have a no knock rule in our homes. I have 12 siblings, I have never once knocked at their homes, either of our parents' home, or my mother's parents' home (when they were still with us), and they have never knocked at mine. Any member of my family is welcome to walk into my home if my door is unlocked and most have a spare key or know the garage door code. I would be insulted if one my brothers, nieces, or nephews felt like they could not walk in to my home as if it was theirs.