The mother of a missing Pennsylvania teenager who disappeared with a 45-year-old married father of four is begging her daughter to come home.

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Amy Yu, 16, was last seen on March 5 at at her school bus stop in Allentown where she was dropped off with her younger brother. Police believe she ran away with Kevin Esterly.

"Amy, can you come back to me?" Mui Luu, the teen's mother begged during an interview with CBS News. "I love you. I just hope you come back."

Yu was friends with one of Esterly’s daughters and had gone  on vacations with the family.

Police believe the teen was in a secretive relationship with Esterly, according to news outlets, and willingly left with him.

"Why would a 45-year-old man and a 16-year-old girl … like, that's disgusting," the girl's younger brother, John Yu, said to CBS News.

Esterly’s wife said he withdrew $4,000 from the couple’s bank account and took important documents with him when he left.

Authorities believe Esterly is driving a 1999 Red Honda and are asking for the public’s help in locating the teenager.

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8/26/17 - Atlanta, GA - Georgia leaders, including Gov. Nathan Deal, Sandra Deal, members of the King family, and Rep. Calvin Smyre,  were on hand for unveiling of the first statue of Martin Luther King Jr. on Monday at the statehouse grounds, more than three years after Gov. Nathan Deal first announced the project.  During the hour-long ceremony leading to the unveiling of the statue of Martin Luther King Jr. at the state Capitol on Monday, many speakers, including Gov. Nathan Deal, spoke of King's biography. The statue was unveiled on the anniversary of King's famed "I Have Dream" speech. BOB ANDRES  /BANDRES@AJC.COM

Credit: Bob Andres