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By Amalie Benjamin Globe staff They were 8 or 9 years old when they started dreaming. Devin and Jason McCourty decided then - their minds convinced by the magic of television - that they would buy their mother a house. Phyllis Harrell had, after all, raised them as a single mother after their father died when the twins were 3, had shuttled them to modeling and acting sessions - they were once extras on ``Saturday Night Live'' - would take them to AAU games and football practices. She