Neb. Rev. Stat. § 40-104
Except as otherwise provided in this section, the homestead of a married person cannot be conveyed or encumbered unless the instrument by which it is conveyed or encumbered is executed and acknowledged by both spouses. The interest of either or both spouses may be conveyed or encumbered by a conservator acting in accordance with the provisions of the Nebraska Probate Code and may also be conveyed or encumbered by an attorney in fact appointed by and acting on behalf of either spouse under any power of attorney which grants the power to sell and convey real property. Any claim of invalidity of a deed of conveyance of homestead property because of failure to comply with the provisions of this section must be asserted within the time provided in sections 76-288 to 76-298.
A purchase agreement or contract for sale of homestead property signed by both spouses does not require acknowledgment to be enforceable.
Neb. Rev. Stat. § 40-104