Zubeidat declined to be drawn on which mosques her son frequented, saying he went to any mosque he could go to. Media reports have focused on the Kotrova mosque in Makhachkala.
And she vehemently denied reports that Tamerlan had sent her text messages talking about the radical nature of his faith and that he was ready to die for Islam.
But, she said, he was always in her thoughts.
"I remember him always, always from the first day that he was born, there was no day that I don't remember him. ... He was the most caring son," she said.