This has been really useful, thanks so much. I am now clearer in my head that if my Irish sister inherits the family home, which is the preferred option for my dad as he’d rather it was not split up, then the money owing whether in exceeding inheritance/gifts thresholds and/or Fairdeal if need be, then it is up to them to come up with the solution best for them. They will have after all benefitted twice and if they want to keep the house they will need to come up with the cash. If they can’t, they will need to get advice on splitting the property from the land and selling it. While it may not be dad’s intention that it be split, that may be the outcome but he won’t be around to worry about that I suppose.
The NZ sister and I will have been treated equally with each other, and that will have to satisfy them.