Your father is not obliged to give anything to you and it is his own will and wish to give anything to your elder brother but nothing to you.
He dont have to keep you informed about all his activities, it is his own privacy.
You do not have any rights over his property or money.
You cannot grumble that he has not apportioned any property to you nor did he give any financial assistance to you.
He need not give anything to you since you are an adult and no more dependent on him.
After 18 years of age, you are no more dependant on him, legally.
Therefore you have no options to claim any share from his property during his lifetime as a lawful right.