1) you have to make application to the authorities for mutation of land in name of the 4 legal heirs
2) you have to enclose copy of your father death certificate , succession certificate
3) notice will would be issued to all legal heirs . If no objection received land would be transferred in name of legal heirs
4) don't transfer land in name of your mother recently there have been cases wherein mother on being absolute owner have favoured one son or daughter over other legal heirs
5) once you execute relinquishment deed in favour of mother you lose your share in said land
6) local lawyer can guide you in this regard . It should not take more than 6 months
7) you would need to grease a few palms to expedite the whole process