Sorry for NC, and I'm not being grabby! DParents were talking to me about their will at the weekend and I have a couple of questions but obviously I can't ask them. With any luck we have a few years yet 
Dparents have a large rural house with a couple of acres. I have 3 sisters who will share the estate:
DSis1 is to have the house and garden.
I'm to have the end field (a half-acre paddock).
DSis3 is to inherit jewellery and effects.
Dsis4 is basically disinherited for reasons I don't want to discuss, DDad says she can't challenge the will and it's watertight because he's left her 'something'.
DSis 1 & 3 and myself are all very happy with the way it's divided, so no tussles amongst ourselves but I have some questions if anyone has any experience of this please.
The entire estate is over the IHT threshold, so I assume 40% of the full value needs to be paid rather than each of us only pays IHT if our inheritance is less than £325,000? I think DSis1 will struggle (house and garden) so does that mean none of the estate is released until the entire 40% is paid or would there be individual liability for our own share iyswim? If DSis1 can't pay would everything have to be sold and we receive shares of what remains? Unfortunately it's not possible for me or DSis3 to help her financially with that.
I fully expect DSis4 to challenge the will and I have no ill feeling towards her for this, I think most people would do the same. What's the likely outcome here? I assume the whole thing stops until it's settled, but would the estate then just be split 4 equal ways? I'm happy with the field and I don't want more but I imagine this will be messy. I'm assuming if DSis4 challenges the will for 1/4 estate that I can't just have my field and quietly go on my way? The field would make an enormous difference to me for reasons I'm not going into here, but would need the main property to be in the family for me to access it easily.