The father of an American woman who was rescued from a Taliban-linked group that held her and her family captive for five years is questioning why his son-in-law took his pregnant daughter to Afghanistan.

Caitlan Coleman, her husband, Canadian Joshua Boyle, and their three children left Pakistan after being rescued, according to The Associated Press. They arrived in Canada late Friday.

Coleman's father, Jim Coleman, said in an interview with ABC that he cannot fathom Boyle's conduct. “Taking your pregnant wife to a very dangerous place, to me, and the kind of person I am, is unconscionable,” he said.

Caitlan Coleman and Boyle were abducted in 2012 while traveling in Afghanistan. The 32-year-old Stewartstown, Pa., native was seven months pregnant when she was captured.

Following their rescue this week, Boyle refused to board a U.S. transport plane, according to U.S. national security. He later issued a statement after landing in Canada Friday night, stating Haqqani network in Afghanistan killed his infant daughter in captivity and raped his wife, AP reported.

Here is a look at Caitlan Coleman and her husband Boyle:

Who is Caitlan Coleman?

Coleman grew up in Stewartstown, Pa., a tiny borough in York County with about 2,000 people. She was known as a devout Catholic and a woman with a good soul. Friends would recall her countless acts of generosity from the big things (raising money for the poor in Haiti) to the small (always remembering to send thank-you notes.)

Why was she on this trip?

Coleman was also someone bitten by the travel bug. She was seven months pregnant when she told friends and family about her next adventure in 2012: a trip to Central Asia, perhaps Kazahkstan, Kyrgyzstan and Tajikstan where she and her husband could dip into life with the locals and help out aid groups. Caitlan's mother told The Philadelphia News that Afghanistan was not part of the plan. "They promised us they wouldn't go," Lyn Coleman said.

More:After 5 years, family kidnapped by terrorists in Afghanistan now free

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Who is Joshua Boyle?

Boyle is a Canadian who met Coleman on the Internet where they bonded over Star Wars. The couple married in 2011. Boyle attended a Mennonite school as a child and graduated from the University of Waterloo in 2005. Friends describe a pacifist who felt a calling to do humanitarian work — sometimes in dangerous locales.

Is Boyle's earlier life connected with the abduction?

Boyle had a self-described intrigue over terrorism. “Anything related to terrorism on Wikipedia, I wrote, pretty much,” he told the Globe and Mail in 2009. He also developed an interest in Omar Khadr, a Canadian captured in Afghanistan who was held at Guantanamo Bay from 2002 to 2012. He married Khadr's sister in 2009, and some colleagues thought he was considering becoming a Muslim. The FBI has said there is no connection with Boyle's earlier life and the couple's abduction.

Where were they kidnapped?

The couple, who had been in Central Asia for several months, were taken hostage in October 2012 in Wardak province, a Taliban stronghold near the Pakistani border. Coleman had three children while in captivity; Boyle even claimed to have delivered one son by flashlight.

Coleman’s parents last heard from their son-in-law on Oct. 8, 2012, from an Internet cafe in what Boyle described as an “unsafe” part of Afghanistan. The family was being held by the Haqqani network, a group called a terrorist organization by the U.S., but one that does not normally execute Western hostages — preferring cash ransoms.

Contributing: The Associated Press

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