Reunion of Ellen with Her Parents in "Number the Stars"

How is Ellen reunited with her parents?

Ellen is reunited with her parents with the help of the Resistance.

How does the reunion with Ellen's parents change the relationship between Ellen and Annemarie?

The reunion changes the relationship between Ellen and Annemarie.

Final answer: Ellen is reunited with her parents with the help of the Resistance, and the reunion changes the relationship between Ellen and Annemarie.

Explanation: In the book 'Number the Stars' by Lois Lowry, Ellen is reunited with her parents when they escape from Denmark to Sweden with the help of the Resistance. The Resistance, a group of people who opposed the Nazi occupation, helps Ellen's parents cross the sea. The reunion with her parents brings a significant change in the relationship between Ellen and her best friend Annemarie. Before the reunion, Annemarie had been pretending to be Ellen's sister to save her from the Nazis. After the reunion, Annemarie realizes the importance of family and the risks Ellen's parents took to be with her. This strengthens their bond and deepens their friendship.