1)it was your grand father self acquired property . on his death your mother received her share of the property . you have no claim on amount of Rs 33 lakhs received by her .
2) you have no claim in the land bought in your mother name . your mother can bequeath /gift the land to whomsoever she desires
3) it is only if your mother dies intestate ie without any will would you and your brother have 50%share each in said land