But Anzor Tsarnaev told the BBC he believed the secret services had framed his sons.
The suspects' father, Anzor Tsarnaev, has said he will travel to the US on Thursday or Friday.
BBC: Boston bombing suspects' mother regrets emigration to US
Anzor Tsarnaev may be bringing along important information for the investigation into the April 15 marathon bombings.
They settled in a working-class part of Cambridge, where the father, Anzor Tsarnaev, opened an auto shop.
Her husband, Anzor Tsarnaev, said Thursday that he expected to fly soon from Dagestan to the United States.
The suspects' father, Anzor Tsarnaev, said he intends to travel to the U.S. "I want normal justice, " he said.
Anzor Tsarnaev recently moved back to Dagestan after he and his wife divorced.
Anzor Tsarnaev said he was "outraged" by his son's decision to drop boxing.
With four children, Anzor and Zubeidat qualified for food stamps and were on and off public assistance benefits for years.
While in Makhachkala, Tamerlan proposed to his father that they start a trading business, importing Chinese goods, Anzor Tsarnaev said.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
In an interview, Anzor Tsarnaev, father of the two alleged bombers, said the FBI visited the family's apartment in Cambridge, Mass.
They trained at the same gym, and the pair met "a few times" in recent years at boxing events, Anzor Tsarnaev said.
It was not immediately known whether Anzor Tsarnaev was ever admitted to a hospital and, if so, if he is still there.
The brothers' father, Anzor, said Tamerlan was with him while in Dagestan.
Anzor Tsarnaev said he advised his son to leave for safety reasons.
WSJ: Boston Suspect Tamerlan Tsarnaev's Dagestan Visit Scrutinized
At a news conference in Dagestan with her ex-husband Anzor Tsarnaev last week, Tsarnaeva appeared overwhelmed with grief one moment, defiant the next.
Anzor said he grew up in Soviet times, when it was taken for granted that Muslims didn't have to follow such strict rules.
She recalled having a Skype conversation with Anzor, while he was in Makhachkala, and spotting Zubeidat in the background covered in a veil.
Her husband, Anzor Tsarnaev, is expected to step off a flight in the United States in the coming days after a long journey from Dagestan.
The suspects' father, Anzor Tsarnaev, has said he will travel imminently to the US. The family wants to take the dead son's body back to Russia.
"I told him I trained him all his life so that he could accomplish something, so that he could be a champion at something, " Anzor said.
The friend who rented an apartment to Tsarnaev family said the father, Anzor Tsarnaev, was a talented car mechanic and aspired to open his own garage.
The parents, Anzor Tsarnaev and Zubeidat Tsarnaeva, plan to fly to the U.S. on Thursday, the father was quoted as telling the Russian state news agency RIA Novosti.
In Cambridge, workers at Webster Auto Body at the corner of Webster Avenue and Norfolk Street believe the brothers' father, Anzor, worked at the body shop about five years ago.
Though he is ethnically Chechen, Anzor Tsarnaev grew up in the former Soviet republic of Kyrgyzstan because his parents were deported there in the Stalin era alongside many other ethnic Chechens.
Their father, Anzor Tsarnayev, has since returned to Russia.
The father, Anzor Tsarnaev, and Dzhokhar arrived in the US on a tourist visa in April 2002 and applied for political asylum, federal law enforcement officers told the New York Times.
The suspects' parents recently returned to Dagestan in the Caucasus region after living in the United States for about 10 years because they were "nostalgic, " the father, Anzor Tsarnaev, told Russian state-run Zvezda TV.
Anzor Tsarnaev has expressed a desire to go to the U.S. to find out what happened with his sons, defend the hospitalized son and, if possible, bring the older son's body back to Russia for burial.
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