What happens when father’s will favors only one son?

Before his death, X wrote a will. X’s property isn’t his personal property but family property. Out of his 5 children, only one is a son. The will was in the son's name, and X had mentioned that the son should take care of him in his old age. However, the son had resigned from his government job and moved abroad, living a prosperous life. The son was absent for 25 years. Now, both X and his wife are deceased. Some of X’s daughters are demanding a share of the property and have filed a case in the Munsif Court. Who does the law favor? Can the son, who didn’t take care of X, be given favorable consideration?