LegalHeir certificate

Family from TN: Father's death certificate spells name correctly. No Aadhaar. No Ration Card. Mother's death records show our father's name correctly. My parents had five children. 1 : Male. Death Certificate reflects name of parents correctly. 2: Female. Death certificate has father's name with wrong spellings.No Aadhaar. 3: Male. In Aadhaar, Death & legal heir certificates, father's name has same misspellings as at 2. 4: Female. Married. Alive 5: Myself. Aadhaar reflects Father's name with misspellings as at case 2. Birth certificate reflects name of parents correctly. Question: How to go about getting legal heir certificate for my father correctly?