Sun Jul 10 2011, 04:13 hrsArun Shourie writes about bringing up his son Aditya, afflicted with cerebral palsy for many years now, in his new book, Does He know a mother’s heart? (HarperCollins). Adit’s pain and that of the author’s wife Anita, who suffers from Parkinson’s disease, leads him to ask: how can there be extreme suffering if God exists? Suffering, he says, refutes religion. Exclusive