Miranda is Tims ex girlfriend, who he met in fort saint john in the years he was away from heartland after his addiction. When they conceived Shane, Miranda broke up with Tim because he was still facing addiction, and did not want Shane to grow up with an alcoholic father. In season 3 she brings Shane to the dude ranch and tells Tim that she has his son, but Tim wants to take a DNA test. It turns out that Shane is their son, but then Miranda runs away with Shane. In season 4 Miranda has a few appearances, and in season 5 she has 1 appearance. In season 6 she and Tim try to rekindle their relationship.