A number of years ago I bought a house which was my parents and my main residence. I subsequently married and moved home. My parents remained living in the house rent free and without consideration until their death – my father in 2020 and mother in 2024. I am now selling the house. My understanding is that dependent relative relief would apply from the date on which the elder of my parents became incapacitated by old age. Is this correct? And does the relief still apply while both parents are alive or only once the surviving parent became widowed?