CGT on a property already 50% owned

Back in may 2016 my father past aware and in doing so my mum and dads house passed over in his will to my mum and myself as there only son so we were 50/50 joint owners , In July this year my mother was killed in a car accident and i have spent the last few difficult months sorting out her affairs and the probate procedure . As part of the probate the house has been valued as £230,000 and we are going to market at £260,000 as i already owned 50% of the property and have for 8 years how do i work out the gain if we do sell for the asking price , any help and advice would be very much appreciated Thanks John

Hi,
You can see guidance here:
Tax when you sell property 
It gives you guidance and includes a calculator to help you work out if there is a gain.  
You inherited 50% of the property on the passing of your father. You will need to obtain the probate value of the property at that time to work out 50% of the value. This is the value you acquired 50% of the property at. You also need to do the same to work out the other 50% you inherited when your mum passed away. By adding both figures together, you have the acquistion value of the property.  
You may be entitled to claim Private Residence Relief if this property was your private residence during your period of ownership. You can see more information here:
HS283 Private Residence Relief (2024)
Thank you.