My son lives in berlin. he bought an old section of a 2 story barn that he is fixing up, to be a summer home?

home for his family, including my 4 year old grandson. i walked in and saw my son carrying asbestos in his hands. my grandson was playing within 10 feet. he was wearing gloves, but, no mask to cover his mouth and nose. it worried me,,,so i told him about mesothelioma, a respiratory/lung disease. and my concern that my grandson was right there, inhaling the asbestos. he told me to mind my own business...that it only is airborn if it is moved. well, it was being moved. can he and my grandson contract mesothelioma from this action, and, if yes, how long can it take to materialize into mesothelioma. thanks.. sheri