The father said they attended prayers at several mosques around town, including the main mosque in downtown Makhachkala, as well as others, like a Salafist mosque on Katrova Street, that has drawn the eye of authorities.
The Imam there told ABC News Wednesday that they had never seen Tamerlan there, but noted that they have many people who attend prayers, with the faithful often forced to pray out in the street for lack of space.
The mother denied the mosque was as radical as some have claimed, asking why, then, it was still allowed to operate.
The mother said she never detected signs that her son had become radical.
She denied reports that a mysterious man named Misha, an Armenian convert to Islam, had radicalized Tamerlan.
She described Misha, whose last name and identity remain a mystery, as "the nicest man."
She said Tamerlan had befriended him at the mosque and he came to their house at least twice. While there, Misha showed them how to pray and the mother said that she was ashamed a convert knew Islamic traditions better than she did.
After Misha left, she said they were in awe of him and sought to follow his example.