Not farming but I know of a will that one of the daughters contested and took a third,she’d made her feelings felt when the deceased was alive and hadn’t had contact for 25 years,subsequently she was written out of the will.As I've said before all wills can be challenged no matter how watertight you think they are, when someone says to you that whatever happens I'm going to make sure you have nothing it makes you realise whatever is contained in a will is just words