So split the aunt's property in two and he takes the sheds as part of his inheritance.
May not be that simple for lots of reasons
For a start
first house will need a half acre site,
we don't know where the septic tank is located
we don't know where the water connection is located
we don't know if splitting the property will slow down sale according to op father doesn't like the idea of someone else accessing the sheds it is not just because of the machinery issue he wants to hold on to them ,
Buyers may have the same Issues as op father has when the property gets split,
even if they get a sale we don't know what issues crop up at engineering stage,
DR Strangelove posted this is a human problem not a financial problem,
I suspect the op uncle has the best option already sussed out
The op Father moves into late sisters house this sorts out the Tractor Issue and also sorts out control of late sisters sheds
well it appears to be turning into both a human and financial problem,
The op says one of the brothers has no money and is greedy but I don't think from the posting he is greedy more likely he wants his share as soon as possible and would take a little less than 50% to get it sorted,
Splitting property may make it unsaleable or at the very least slow down both the selling the closing of the sale ,
Of course there are other options if they want which should work out cheaper lots of firms in the agri industry dismantle argicultural sheds and re erect on a different site, or dismantle shed before selling which would sort fear of it being used by the new buyer of there late sisters house,
If you look up the likes of donedeal you will see lots of erected farm sheds for sale and people who take them down for a living,
I am sure the price they get for the shed/sheds standing will cover the cost of a new shed to house any machinery he still has,
The can then sell there late sisters property split the money 50/50 not the property and enjoy the rest of there lives on good terms,
Daisymay
Brothers could put an Add in donedeal/farmers journal .
Looking to sell sheds( as is still Standing )stating Price and must have insurance to take down and remove from property,
They can also look for a price for taking sheds down and not rebuild again
Or build fully or rebuild a section of the buildings on your father property,
The old saying where there is a will there is a way,