I am surprised that the Will is being contested AFTER probate has been granted. It is normally contested before, to prevent the Grant being issued. It is more likely an Inheritance (Provision for Family and Dependants) Act 1975 claim for reasonable financial provision and not a contest to the will's validity. If probate has been granted, there is nothing, in theory to stop you selling the property, but depending on the type of the proceedings - BUT you must not attempt to distribute the proceeds, they should be kept in an interest bearing account pending resolution of the dispute. However, best practice would be for you to keep the "other side" informed of the sale. You do, however, need urgent legal advice.