Gifting equity from a property

Hi - we bought a house for my husband to live in during the week because his work location was too far from home to commute - after 3 years he changed jobs so the property was rented out for 13 years. Last year our son and his wife moved into the house (tenant had left) - We are selling the house and want to give the equity to our son - he wants to move so will use the equity to help buy another house. What is the best way to avoid paying more CGT than is necessary?

Hi,
Please note, HMRC does not give advice on how to pass on your own property, money, and possessions.
You can see guidance on Capital Gains Tax here:
Capital Gains Tax: what you pay it on, rates and allowances
Thank you.