Egyptian Geese in School.

Hi All, my colleague reported to me yesterday that she had seen a family of Egyptian Geese - Mum, Dad and babies - on our school field. Our school grounds are mostly open fields, with two small areas of woodland, we are a mile away from the nearest water (the Grand Union Canal). I was wondering a) are they lost, is a school playing field a usual place for a family of geese? b) are they safe - we have buzzards, foxes, cats and other predators? and c) as the goslings look almost newly hatched and are certainly not going to be able to fly for some time, will Mum and Dad happily co-exist with the children when they come back from their Easter holiday, I understand they can be quite territorial. Apologies if these are silly questions, I'm a long way from being an expert.