title: When does EF Core automatically create / update navigation properties?
body: <p>I'm seeking clarity on the behavior of EF Core in regards to child (and grandchild) navigation properties.
  If I load, with tracking, an object Parent, which has a list of Child objects, who each have a Grandchild object...</p>
  <ul>
  <li><p>If changes are made to the grandchildren, will those records automatically be updated via update(Parent)?</p>
  </li>
  <li><p>If children are added / removed from the list, will those records automatically be created / deleted via update(Parent)?</p>
  </li>
  <li><p>When I am initially creating the Parent, will the Children and Grandchildren automatically be created via create(Parent)?</p>
  </li>
  </ul>
  <p>Thank you!</p>