<p>It is easy to take for granted the things that are always around us, the people who are always there. And yet they often hold the keys to who we really are.<br>Nick Duerden's grandparents were always just . . . there. A mysterious yet unchanging presence, a source of dutiful visits, birthday cards and carefully preserved rituals: lunches, dinners and endless card games.<br>But, as he enters midlife, and his 98-year-old grandmother enters a car...