Despite the information about your earnings and dependents, it is almost impossible to give an accurate figure for how much you could potentially claim back after filing tax returns.
What I would suggest you do is either contact the IRS for the relevant forms and documentation, and study that carefully to accurately work out how much tax will be paid back to you.
OR
You can also make use of an online tax calculator, which should take a matter of minutes to complete, and will give you a rough estimate as to what you can expect your tax outcome to look like.
You can find such a tax calculator here my friend: https://turbotax.intuit.com/tax-tools/