When you uproot people, you move them from one place to a completely new one. Your parents may need to uproot you if your mom gets a new job all the way across the country.
One meaning of the verb uproot is "move," especially when a person is forced to move. Another way to use uproot is more literal: to pull a plant out of the ground, roots and all. You might, for example, uproot your favorite rose bush and replant it in a sunnier spot in your garden. Interestingly, the figurative sense of uproot is about a hundred years older than the literal meaning, which was first used in the late 1600's.