in russia, but earlier today, abc's bianna golodryga, who speaks perfect russian, reached to him, talked to him on the phone. She reports into us now. Reporter: I spoke with him a total of four times... See More
in russia, but earlier today, abc's bianna golodryga, who speaks perfect russian, reached to him, talked to him on the phone. She reports into us now. Reporter: I spoke with him a total of four times throughout the day. The last time, just an hour ago. He insists his sons are innocent. They are not violent men. They have been framed, according to the father. He says he needs proof, he wants video showing they actually did what they are accused of committing and I asked him, when was the last time he spoke with his sons? He said he spoke with them after the bombings at that marathon on monday. And he said his sons were fine, they had not been there, according to the son, they said they don't, quote, frequent these types of events. And then I asked him, how do you explain the photo, that chilling photo of his youngest son, dzhokhar, standing just feet away from 8-year-old martin richard, so many of us have been talking about it, momen before the m boen went off. He saihe cannot explain that, but he does believe his sons are innocent, though his heart goes out to martin's parents. So, again, he is in disbelief tonight and you said he used a russian word with you. Reporter: "I don't understand." This was a big shock for him. And he is just begging, if he has a message for his son, i constantly asked him that, what do you want us to relay to him? He said, surrendsurrender. I want you to come home alive. You have a bright future ahead of you.
This transcript has been automatically generated and may not be 100% accurate.