Just because you are an adult doesnt mean you dont have a curfew! ETA
My DS is 19 and is having problems with one of the rules I have for the house. At midnight I lock the house up. If you are coming home you have to be there before midnight. That is when I lock up, lock the chains, set the alarms, and go to bed
Now I do not care if he doesnt come home some nights. If he wants to stay at a friends or his gfs house that is fine but I still lock up the house at midnight
He says I am unreasonable and I should let him come and go and I told him no way. I do not feel safe going to sleep without the security (we were broken into a few years back) and it isnt going to happen
ETA: even if I left the chain lock off he still wouldnt be able to open the door without setting off the alarm waking us all up.
ETA2: My DS has a key. He doesnt have the code because we changed it while he was away but he could have that also....however none of that will help the situation. As soon as the door is opened the alarm goes off so even if he had all of that the whole house would be woken up. How is that fair to everyone else? Why should 6 people be disturbed so he can go out and come home whenever he wants? None of my other 4 kids have any issue with the rule and think their brother is being a jerk