Melania and Barron Trump have now both moved to the White House to join Donald Trump.
The First Lady and her son had been living in New York whilst the 11-year-old finished his school year at Columbia Grammar and Preparatory School.
The pair arrived with the President on Air Force One at a military base in Washington. Barron was seen playing with a fidget spinner, which is a popular children's toy, according to Le Figaro.
Melania Trump's parents, from Slovenia, also joined the family at the White House.
Trump made history after his inauguration by becoming the first US President in history to move into the White House without his wife.
Barron is now set to continue education at St Andrew's Episcopal School, which is a private school in Washington.
After their arrival Melania Trump tweeted a photo of the Washington Monument with the caption: "Looking forward to the memories we'll make in our new home! #Movingday."