The money you hear about people getting for just filing a tax return claiming kids requires them to have some earned income (wages or self employment). Without earned income, they are not eligible for the "refundable" Earned Income Credit or Additional Child Tax Credit.
A child can be the “qualifying child” dependent of any close relative in the household. If you live with someone else, e.g. your sister, it may be better if they claim your child.
Your sister can also claim you, since your income is less than $4150.
