The 8-ton tree will be erected over the ice rink on Friday.
Bill Varanyak tells New York's WNBC-TV the 77-year-old tree was planted after his parent's used it as their first Christmas tree in 1931.
He says it's "the miracle tree" because his late mother always said it would one day be on display at Rockefeller Center.
His brother, Bob, says they recently saw a blue bird in the tree and they believe the bird was their mother guarding it.
While the first official lighting was in 1933, the first Rockefeller Christmas tree was put up two years earlier by workers helping to build the complex during the Depression.