Inheritance of property, then immediately buy out sibling. Is the buyout money taxed as income?

Hello everyone, A property is put in a trust, and upon the death of the grantor/trustee, the two siblings now own the property in the now irrevocable trust. If one sibling buys out the other from the property, is the money that the sibling receives taxable, or is it considered part of the trust the property was in and does not get taxed?  Once the buyout happens, does the title name change to the sibling that bought out the other one?