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Section 121 provides that, under certain circumstances, gross income does not include gain realized on the sale or exchange of property that was owned and used by a taxpayer as the taxpayer's principal residence. Subject to the other provisions of section 121, a taxpayer may exclude gain only if, during the 5-year period ending on the date of the sale or exchange, the taxpayer owned and used the property as the taxpayer's principal residence for periods aggregating 2 years or more.
So, you must use and own the property for 2 full years to exclude gain. The house is owned by both of you so you both would have to report the sale.
Your husband could not use the exclusion because he used it in 2015 and he can only use it every 2 years.
You could use your $250,000 but only on your half of the gain.