Can my father divide property among sons and support widow?

As the eldest son, the death of my younger brother has prompted his wife and her parents to demand financial support from my father for her and her children, and her parents want to take her to their hometown. Is she entitled to receive maintenance from my father? If my brother's wife decides to reside with my parents, can she still seek maintenance for herself and her children from my father? If the answer to either of the previous two points is yes, can she request maintenance according to her wishes, given that my parents are retired and facing health challenges? Is it possible for my father to allocate a portion of his self-acquired undivided property to her for the upbringing of her children? If the answer to the fourth point is yes, can she demand a larger portion of the property from my father? We are five children (two sons and three daughters), and her parents often request a larger share of the property as well as maintenance. Is this request legal?