The cheat squad is the only way to get into the parks to watch, but aside from that, it's not really essential to view you in different areas. Your family can stand along Harbor towards the Hojo side and see you around Mile 1 before we go in the parks. They can also see us as we cross the promenade from DCA to DL around Mile 3. After that, we exit DL and actually run down DTD b/w 5 1/2 to 6 so they can watch you there as well. For the finish, they can be along DL Dr where we exit the parking lot area of DCA right as we enter the parking lot or they can be in the parking lot at PPH. I can't recall for Tink, but at least for the DL 1/2, the grand stand seating is just a section of bleachers that provide seating. But if your family is okay w/ standing, they should be fine.
Hope that helps!