ant550lag

My mother and father were divorced at the time of their death and the joint tenancy of the property was severed at the time of the divorce. My father died intestate in March 2019 and I am the sole beneficiary of his estate. The Grant of Representation reflected the value of his half share of the property at the time of his death. My mother continued to live in the property until she died in April 2022 and the property is in the process of being sold. Will I need to pay CGT on the gain in value of my father's half share in the property since his death in March 2019? If so, how do I calculate the gain in value? Also, when submitting the application for grant of probate for my mother's estate, do I need to declare the total value of the property for Inheritance tax purposes, or only the value of my mother's half share?