1) it appears that will executed by your grand father has been challenged by one of the legal heirs namely your aunt and court has passed orders for equal division of property .
2))once court has passed order for partition of property your mother is entitled to 1/7th share in said property .
3) based on court orders partition of property would be done by metes and bounds.
4) there is no such law for transfer of will in your mother name . your mother was one of beneficiaries of the will which was challenged in court .
5) arrears of tax can be paid with interest .
6) it is necessary to go through the will , suit filed by your aunt , orders passed by court to further advice .
7) contact a local lawyer .