DS1 (4) is in reception.
When he writes or draws he swaps which hand he uses depending which side of the page he is writing on. This means that he mainly uses the left for writing as this is where his words usually start IYSWIM. But if for some reason he starts writing on the right hand side of the page then he will use his right hand. I think his writing is better with his right hand so it seems like he is making life hard for himself.
He has always done this BTW - his childminder noticed it really early on. For example he would draw a circle in two parts, half with each hand. She commented that this was unusual.
I asked his teacher but she hadn't noticed and didn't know what it meant.