Thank you for the link to the IRS table. Yes my AGI is the lower of the two incomes (21,835). According to the Table from the IRS I should received 5,920 compared to the 3,584 from line 27 on my 1040. I don't know if this is a factor, but my son was born middle of May 2020. I don't know if that means he qualifies for the full year or only partially, which may result in less of a credit.
