You do not get money back just for being a single parent, or having children. It is based on your income, deductions, credits, withholding, etc. Some folks get nothing back at all, and owe at tax time.
You can preview your return as follows:
https://ttlc.intuit.com/questions/1901539-how-do-i-preview-my-turbotax-online-return-before-filing
and please file for Child Support.
