Your two boys' SSI income are not taxable and will not have any impact on whether you qualify for the EIC and child tax credit.
For child tax credit, if you qualify for claiming them as your dependents Qualifying Child, as long as they are under age 17 before the end of the year of 2019, you qualify for the credit. ( The exemption and the child tax credit go together with each other)
For Earned Income Tax Credit, if you qualify for the following rules, you get the credit. Qualifying child for EIC
