If A dies leaving property to B who dies shortly afterwards, the property can be taken out of B's estate for IHT purposes by a disclaimer within IHTA84/S142 (1). The requirements are that
The personal representatives of the deceased can disclaim, under IHTA84/S.93, ( IHTM35165) a beneficial interest in possession ( IHTM16061) given or bequeathed to the deceased which, owing to ill health, ignorance of the interest, or brevity of the time available, the deceased was never in a position either to accept or disclaim.