My ex husband returned by children from a contact weekend to advise that he had taken the children (DS x2) to his engineering workshop (business) over the weekend as he had some customers dropping cars off. The children were playing unsupervised (13+10) and DS had climbed on to a tractor and grabbed hold of a motorised door - the other DS turned the motor on lifting DS (10) to over 8ft off the ground at which point he fell off on to a concrete floor. He was largely unhurt but I think it could have been very serious. My Ex thinks this is just boys pranks. This week by other DS (13) returns with a burn hand after a workshop accident. Again Ex thinks this is "part of learning". I have an engineering back ground and realise children need to learn but this is beyond reasonable. Am I being over the top in considering making an approach to social services?