My mother In-law wan't to gift us $57,600 towards a new home. Will we have to pay taxes on the gifted money?

[DoninGA]

Gifts received from an individual are not reported on a tax return, regardless of the amount received.

[Hal_Al]

You may have heard of the "gift tax".  The gift tax return is filed by the person giving the gift, not the one receiving it. "Gift Tax" is somewhat of a misnomer.  Even though a gift tax return may be required, very few people ever actually pay federal gift tax. The purpose of the gift tax return is usually only to document a reduction in the allowable estate tax exemption.
See <a rel="nofollow" target="_blank" href="https://turbotax.intuit.com/tax-tools/tax-tips/Tax-Planning-and-Checklists/The-Gift-Tax-Made-Simple/...>