will excursion

Will mention the vacant land bequeathed to mother and aunt however on vacant land structure/shop was constructed during the lifetime of the testator. Will was not alerted with regard to the build-up structure or shop hence the doubt with regard to this build-up structure or shop exists. The Will had mentioned to use the land for walking purpose but its use was changed subsequently hence the Will becomes invalid and non-operational. If the Will mentioned about any structure built on the vacant land shall devolve upon the mother and aunt, then it would be possible for getting the Will executable, but not now. All heirs of the deceased will get right to claim share in the existing property including both land and shop.

Sir if the will need to be executed legali through court like partition and which part belongs to whom how to do it... please guide