A man passed away, and he had two sons and two daughters. He owned two plots of land, buildings, and the house he lived in. He gave each of the sons a plot of land to build a house on and marry in, which indeed happened during his lifetime. He bequeathed that the house he lived in should be for the two daughters after his death, and this will was made in front of the mother. However, after his death, the sons objected to giving the house to the daughters, claiming it is part of the inheritance. Eventually, they settled on dividing the house into two halves, one half for the sons and the other for the daughters, and the division was indeed carried out. Later, one of the daughters found in her share of the house a handwritten 'written will' from her father stating that the house is for the two daughters by a legal will signed by the deceased, but it does not have any witness signatures. What is the ruling of Sharia on this?