If this was your mother's home there must have been a probate filing for her estate. The probate inventory should have listed the home at it's fair market value. As an alternative
to that, you can have an opinion of value or an appraisal of the property, even now as of your mother's date of death.
The point is that given the real estate market, it is likely that the home was worth at least as much as it is now & possibly more. That being the case, there would be no capital gain to worry about when you sell the home.
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