My school kids that just left was all done verbally with the idea my contract says I don't do school age so leaving wasn't an option as was the fact I am not the school zone for any of them anyways. All of them did it verbally with flexible leaving dates as in left open ended on my part. I planned my advertising giving a couple weeks leeway for each one knowing I didn't want to fill the spaces over the summer anyways and have time with less kids.