My mum died many years ago. My dad met a new partner a short time later. They have not married. My dad has told me that he has written his will to state that if he dies first, his partner will have the right to live in his house until she dies, after which I will get the house. I believe his savings and investments will pass to me immediately on death. I’m not sure what the total value of the estate could be, but I think it could surpass the IHT threshold of 325,000 if the house and savings and investments are all combined. I don’t know much about these types of wills (lifetime interest?), but I am concerned that I will be liable to pay IHT immediately on his death (which is likely to come before her death) despite not having access to any capital on his house immediately when he dies. I already have money worries of my own and have no idea how I would pay such a bill if that was the case. It is a sensitive issue and I do not wish to cause upset by discussing this with him, but I am starting to really worry about what I may need to pay. It wouldn’t be an issue paying the bill on her death as I would be able to sell the house, but if I can’t do that on his death, how do I pay the bill? I believe she has substantial savings of her own (and children from a previous marriage), so these IHT issues could be complex as I think IHT could be payable twice as they are not married? If anyone has any knowledge or insight, I would be so grateful.