Husein Smadi, 18, was accused of drug charges in California and taken into custody Sept. 24, the same day his 19-year-old brother, Hosam, was arrested in Dallas.
Their father, Maher Hussein Smadi, said Monday that Husein returned home late Saturday on a U.S. military plane, was handed over to Jordanian authorities and released.
Husein Smadi earlier was arrested in Santa Clara County and pleaded guilty to possession of a controlled substance. He was in immigration custody for overstaying his visa.
Hosam Smadi awaits trial after pleading not guilty to one count of attempting to use of a weapon of mass destruction and one count of bombing a public place.