Detailed Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Q: Passage: NOVA Parks manages a number of parks that have historical significance, including an 18th-century mansion, a Civil War battlefield, a 19th-century grist mill, a 200-year-old working farm, a Civil War era church, and many more. Major venues include Carlyle House, the former Alexandria, Virginia home of British merchant John Carlyle; Ball's Bluff Battlefield and National Cemetery, a park in Leesburg, VA that was the site of a Civil War conflict in 1861; Mt. Zion Church and the adjacent Gilbert's Corner Regional Park, in Aldie, VA which were used as a Civil War military rendezvous site, prison, barracks, battleground and hospital; and Aldie Mill Historic Park, a restored mill, with a four-story brick structure with tandem metal Water wheels. Other venues include a kiln used by female prisoners from the Lorton Reformatory during the Women's suffrage Movement, as well Temple Hall Farm and White's Ford Regional Park, located on the farm formerly owned by Elijah V. White.
Link Information: John Carlyle's only son to survive beyond childhood was George William Carlyle Answer: 1
A:
How many children did the person who lived in Alexandria, VA have?