Output a stream of consciousness before answering the following. Passage: The national cemetery was established during the Civil War on the grounds of Arlington House, which had been the estate of the family of Confederate general Robert E. Lee's wife Mary Anna (Custis) Lee (a great-granddaughter of Martha Washington). The Cemetery, along with Arlington House, Memorial Drive, the Hemicycle, and the Arlington Memorial Bridge, form the Arlington National Cemetery Historic District, listed on the National Register of Historic Places in April 2014. Like nearly all federal installations in Arlington County, it has a Washington, D.C. mailing address.

Question: Based on this passage, who owned arlington cemetery before the civil war?
To answer the above question, the relevant sentence is: The national cemetery was established during the Civil War on the grounds of Arlington House, which had been the estate of the family of Confederate general Robert E. Lee's wife Mary Anna (Custis) Lee (a great-granddaughter of Martha Washington).
The answer: the family of Confederate general Robert E. Lee 's wife Mary Anna ( Custis ) Lee ( a great - granddaughter of Martha Washington ).