How should the inheritance of K. Abdul rehman be distributed among his 4 sons and 2 daughters?

In the name of Allah most gracious, most merciful Please give the opinion of the jurist for the following 1. K. Abdul rehman died on 31-12-1978 at the time of his death he left behind 1 wife 4 son 2 daughters. 2. K. Abdul rehman has left behind 8.5 acre of agricultural land. One house, one revenue generating floor mill. 3. After the death of k. Abdul rehman. All the property was register to his wife because all his children where minor. 4. On 13-12-2004 wife of k. abdul rehman died. 5. Know the entire inheritance should be distributed between 4 sons and 2 daughters only. Which is in the name of the wife of k. Abdul rehman. Answer to the following 1. how much does 4 son and 2 daughter will get 2. From 1978 till know the entire agricultural land and floor mill is been manage by the elder brother, from this property he has generated income and purchase other property, with out the concern of the brothers and sisters. Should his income and property been included in the inheritance or not. If yes, then if he question about his hard work then what will be the solution for this. 3. Valuation of the entire property and distributing the share in the form of money is batter or just distributing the area is better. Because the agricultural land is situated at different location and its value also differs.