Presidents and First Ladies Trivia

[RJNorton]

At Christmas a special invitation for a children's party was sent out. The party would be held on Christmas Day at 4:00 P.M. Some of the games played were Hide and Seek, Puss in the Corner, and Blind Man's Bluff. The party was held in the East Room. The children were said to have run unrestrained "as if on a Texas prairie."

Who was the President at this time?