Who is Peter Van Daan, and how does Anne describe him?

Peter Van Daan is the Van Daan's son, who is staying in the annex with the Franks and his parents. He is fifteen when they first go to live in the annex and described as shy, awkward, and spoiled.

Peter's going on sixteen, a shy, awkward boy whose company won't amount to much. Mr. and Mrs. van Daan came half an hour later.