This is complete and utter nonsense. This is like the Catholicism belief we are all born with sin, then how can we be free and be redeemed? no one but I/You has any control over how much bhagti is done, we are the ones who can steer ourselves, the parent is the teacher, should he/she put them on the path they may follow it, some fall off it and some do so of their own accord. Saying that no harm will come from any amount of Simran done by the mother. Sikhi is so easy and clear to follow but people make it so difficult with nonsense beliefs of their own and preaching this that and the other.