I came home to find mum crying. It was a surprise because I had never seen her crying before."What's wrong, mum?" I asked, putting an arm round her shoulder."It's nothing. I'm just being silly.""Come off it. Mum, it's obviously not nothing ... you never cry.""Well, it's your father and me. We had an argument." I knew that wasn't all because they had argued before and mum never cried. She saw my distrust and smiled nervous...