I have twin boys, just turned 2. They are mostly pretty well behaved and get on fairly well, so I've rarely had reason for any kind of punishment. We have occasionally (probably 2-3 times each?) put them outside the kitchen (other side of stairgate, can still see us) at mealtimes if they start messing about to the extent they wind the other one up. That has only ever been for seconds, they come back, settle down nothing more is said.
But twice now I've had to put DS1 outside the livingroom, closing the door on him because he has headbutted his brother. He has used his head when he was angry since he was a baby, now if they are arguing over something (and his hands are therefore occupied in trying to wrestle it away) he sees his head as an alternative weapon to use. I mostly ignore their little squabbles, separate if it gets heated, but these 2 occasions the headbutting happpened unexpectedly and to my mind is well beyond what is acceptable so DS1 is dumped outside while I give DS2 a cuddle (he has a head like a rock it seems, has never been as bothered by this as he is at losing a tug-of-war over a toy).
But what should I do when DS1 comes back? I feel an apology is in order, but they are emotionally quite young - they were 2 months premature which physically seemed irrelevant from the end of year one, but behaviourally it seems more accurate to use their corrected age. So he doesn't have the language, not sure he has the understanding. I can get him to give his brother a hug and kiss, but his brother doesn't really want grabbed and slobbered on. They sign quite well, but have no interest in the sign for sorry - does it just not mean much at that age?
I'll probably just carry on telling him what he did wrong, asking him to give me a hug, but I'd welcome other suggestions and ideas when this might start to mean something to him.