Where is Melania Trump? First lady, Barron Trump missing from Trump family vacation

First lady Melania Trump and 10-year-old Barron Trump were noticeably missing from a Trump spring break gathering in Aspen, Colorado over the weekend.

While the older Trump siblings, Ivanka, Donald Jr. and Eric, took to the ski-resort town for vacation with their families, Donald Trump's third wife and their son did not attend.

Donald and Melania Trump through the years:

The three siblings and their families headed west over the weekend, with Donald Trump Jr. Instagramming a photo from the cockpit of an airplane writing, "Family spring break time."

Ivanka and Donald Jr., along with his wife Vanessa, were spotted walking the streets of Aspen on Sunday. The Daily Mail notes they ate at Ajax Tavern before enjoying some shopping.

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Melania and Barron reportedly stayed behind in New York City, however they did join President Trump at their Mar-a-Lago estate in Florida over the weekend. The first lady has been residing at Trump Tower in New York since the inauguration, so that Barron could stay enrolled at the same school. Melania and the 10-year-old first son are expected to join Trump in Washington when the school year ends in June.

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The Trump siblings were together during their father's inauguration, however they have spent most of their time apart since Trump's election win. Ivanka, her husband Jarad Kushner and their three children moved to Washington D.C., while Donald Jr. and Eric took over their father's businesses and have been traveling for the company.

Tiffany Trump, Donald Trump's daughter from his second marriage to Marla Maples, was also absent from the Aspen getaway. However, she did join Donald Jr., Eric and their wives for a Trump business opening in Vancouver in late February.

See Barron through the years: