based on what was stated when your mother passed you and your sister became owners of 50% of the home. your basis is 50% of the fair value of the property on the date of her passing. if the sale price net of selling costs was more than that FMV you have a taxable capital gain. if a loss it's non-deductible loss. Since it was not your primary residence for 2 out of 5 years before sale there is no home sale exclusion available to you. if there is a gain
