My Grandfather deceased way back , in 1997 and none of his family person cared to apply for a legal heir despite not having any form of Will(I don't know why). The property tax and other taxes are still being paid in his name. My grandma was too old and not in healthy conditions to do the paper works and she died in the year 2004. My grandma doesn't have any property on her name. He has three children-> Two daughters and one son (My father). My father died out of health issues in 2017, leaving with three legal heirs- Widow (my mother), two son(me and elder brother), we are above 18 when my father died. My father's sisters are alive. and in decent old age level health condition.
Now finally elders in the family decided to get things done and get their shares of the grandfather's property and applied for legal heir certificate. Now my query is that...who exactly are legal heirs now?. Should they include us (My mom(widow), my elder brother and me) . or just my Grandfather's direct children? i.e Two sisters and one son (Late).