Abdullah Khadr, the eldest son of a reputed Canadian Al Qaeda financier, was arrested by the RCMP yesterday on terrorism-related charges at the request of American authorities. The 25-year-old Canadian recently returned from Pakistan where he was held for 14 months without charge. He was arrested last night after agreeing to meet an RCMP officer at a McDonald's near his Scarborough apartment, his relatives said last night. His mother, Maha Elsamnah tried to intervene in the arrest and was also taken into custody, but later released without charges. Khadr's brother, 22-year-old Abdurahman was also at the fast food restaurant and...