<p>We were not allowed to have locks on bedroom doors. My parents didn’t have one either until my older sister was a teenager and was caught stealing from my mother’s purse. We knocked on our parents door, but nobody knocked on ours-- they just came right in. For a long time my sister didn’t have a door at all as a punishment for something or other. It had nothing to do with BFs, as my parents didn’t allow any boys upstairs until recently. </p>
<p>The summer before last I was 22 years old and my parents went on vacation for three months and left my sister and I alone in the house while they were gone, and my sister was behaving threateningly so I took the liberty of installing a lock anyway-- a nice one that required a real key, like for an outside door. I gave my mom a key when she got back. She didn’t mind anymore by then I guess. I saved the old door knob in case I had to put it back on for them when they got back.</p>