1. When your grandfather expired on 1984 then how was his Will registered in the year 1989 as stated in your initial query?
2. However, the copy of the Partition Deed/Settlement Deed needs to be seen to come to a conclusion whether the property is ancestral or not,
3. If your great grandfather's property has been legally partitioned/settled by all his sons & daughters, then the said property is not an ancestral property and your Aunts can not claim any share in it,
4. No accepting Sumons/Notices issued by the Court does not give you any advantage at all. Rather Ex-Parte order may go against you and your Aunts can file execution petition for execution of the order for which their shares may be devided by meets and bounds,
5. As regsrda the Will of your grandfather, you shall have to apply for probate bacause without probate, an will has no legal value at all,
6. Apply for probate immediately to lay your claim on your garndfather's willed property,
7. Your father's spending money on the marriages of your Aunts have no connection with the instant matter.