you have not mentioned in whose name was agricultural land was bought
2)Section 2(12) of the Karnataka Land Reforms Act defines "Family" as under:
2(12) "Family" means-
(a) in the case of an individual who has a spouse or spouses, such individual, the spouse or spouses and their minor sons and unmarried daughters, if any;
(b) in the case of an individual who has no spouse, such individual and his or her minor sons and unmarried daughters;
(c) in the case of an individual who is a divorced person and who has not remarried, such individual and his minor sons and unmarried daughters, whether in his custody or not; and
(d) where an individual and his or her spouse are both dead, their minor sons and unmarried daughters."
By looking into the definition of family, it includes only the spouse, minor sons and un-married daughters. At no place, "adult sons finds a place under the Karnataka Land Reforms Act.
3) if you are staying separate from your parents your and adult brother income would not be considered