OK, now that you have clarified the problem allow me to quote from a boss I learned a lot from. So how long are you going to let them slide and make you miserable, and affect your paycheck before you write them up?
Write them up. Write them up again if it repeats. Attendance is perhaps the easiest of all personnel problems to fire someone for, I mean either they are there, or they aren’t. Institute a blanket policy and enforce it.
This one ain’t brain surgery.
This is the single worst idea in this entire thread.
Lesson 1 for a manager. If talking to one employee do the following
Praise in public
Kick ass in private
You never, never, never kick one employee’s ass in public. Lose your shit in public at one employee and everyone in the group will think you are an asshole and turn away from you including the ones that you thought you had the support of.
I have a good friend that is a legal secretary. After 30 years with one company she decided to move to another firm. At her going away party some of the comments were along the lines of:
[Senior Partner] Sandy taught me how to do billing
[Another SP] Me too
[Partner] Yeah and she taught me how to do pleadings.
Just because she does not have a JD that does not mean that some seriously smart attorneys did not learn from her.
So back during WWII there was a Navy airbase in Iceland. The base was commanded by Capt. Daniel Gallery (later Admiral)(He was also the guy responsible for the U-505 being captured on the high seas, and later put on display in Chicago)
When a plane from the base sank the first sub, Capt Gallery ordered a party and gave a speech. In his speech he mentioned that every man on the base had a part in sinking this sub including the Captain of the head (the janitor that cleans the bathrooms on the base)
He was greeted by a WTF from the assembled throng. He explained it this way. If the Captain of the head had left the heads on the flight line dirty and disgusting then the pilot of the PBY might have waited until he was up in the air and then used the on-board head in the PBY.
If the sub had been sighted while he was aft with his pants around his ankles it would have been impossible for him to run a successful attack against that German sub.
so yeah the janitor is important. At the car dealer where I was a service I treasured my janitors. One of them was particularly bright and hard working, so I helped him start a company that got the contract from our dealership for all of our porters services, detail and new car prep.
It is amazing what can happen if you work with people.