Inherited property 1982. Only property since 2019. Sold 2024. Calculate Gain for CGT?

Hi- I inherited 1/3 share in a property with a regulated tenancy from my mother in. 1982 and a further 1/6 share from my sister when she died thus bringing my shares to 50%. The tenant died and the house became vacant and In 2019 I bought out my brother's 50% share thus now owning 100% House sold with vacant possession 2024 and since 2019 it was my only property as I had sold my other home. For CGT purposes do I take probate valuations in 1982 and 2001 as the value with the sitting tenant in situ or the vacant possession value? For CGT do I need to pay on the profit gained from the 50% share I bought in 2019 bearing in mind that it was my only property and I lived there after purchasing my brother's share until the the sale in 2024? Any advice would be greatly appreciated please

Hi,
Your aquistion cost will be your share of the probate value from your mother's will, plus the probate value of your share from your sister's will, plus the value of the share to buy out your brother.  
You can claim private residence relief for the period that the property was your main home, have a look at helpsshett HS283 (HS283 Private Residence Relief (2024)).  
There is a capital gains calculator at Tax when you sell property, which link in to registering, reporting and paying the capital gains tax online.
Thank you.