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asked jason and stacey about sierra. >> enlarged heart. >> i think i lost it. i remember just sobbing. >> reporter: lindsey grew so sick, so quickly, that the very next day, she was flown to the children's hospital. the same place they brought sierra for her heart transplant six years earlier. now, it wassimpossible not to think there was some genetic link involving their daughters' heart disease. >> it was our d-day, i think.