NEW YORK - President Biden on Thursday signed into law the sweeping coronavirus relief package, a $1.9 trillion measure intended to shore up the nation's economy through another round of stimulus checks, sweetened jobless aid and a generous one-year expansion of the child tax credit.Most American parents can expect to receive $3,000 a year for every child ages 6 to 17 and $3,600 a year for every child under age 6.