Is there a CGT tax liability on a house which was occupied by my father and sister?

When my mother died, in 2012, she passed her 50% share of the family house to my sister (who also lived there), and to me, who lived elsewhere. My father died in 2023, and he has passed his share to myself and my sister. In my parent's will, they included a clause that my sister could live in the house for as long as she liked. My sister is now thinking of selling the house, is there any Capital Gains Tax liability on my share of the house? It was not my principal residence, but it was my sister's? I am sure that my sister would not be liable to any CGT, but I might be? Many Thanks

Hi,
Yes it is likely that CGT will be due on your share - Capital Gains Tax: what you pay it on, rates and allowances
Thank you.