Sean Rossman

USA TODAY

Inauguration festivities for President-elect Donald Trump are underway, but one member of the soon-to-be first family was notably missing.

The youngest of the Trump children — 10-year-old Barron.

The rest of the family, including Trump's grandchildren, but minus Barron, witnessed the president-elect take part in a wreath-laying ceremony at Arlington National Cemetery. Now, Barron's missing the inaugural concert at the Lincoln Memorial.

Inauguration coverage: Ivanka goes green, outshines Melania in pre-inaugural Trump family appearance

Twitter took notice of the missing Barron:

Where is Sasha Obama?