Tonight Meredith Vieira hosts a special look at Christmases past and present in the White House. 

First Families from the last four decades share holiday memories from their time in office, including First Lady Michelle Obama.  Vieira goes behind the scenes with White House staff as they prepare for the 2012 holiday season and thousands of visitors each day. 

The special also features former First Ladies Laura Bush, Hillary Clinton, Barbara Bush, Rosalynn Carter and their children.

"A White House Christmas: First Families Remember" airs Thursday, December 20 on NBC (8-9 p.m. ET) with an encore telecast on Friday, December 21 on NBC (9-10 p.m. ET).