The law says that the daughters have equal rights in their father's property.
Your aunts are the daughters of your grandfather and as per law they are also entitled to an equal share in the property at par with your father.
Just bcause your father's name has been entered in the RTC records, he cannot become an absolute owner of the entire property.
If others agree for an out of court settlement then they may decide about it and inform court to draw a decree and judgment accordingly otherwise you cannot dictate terms as per your own will and wish.
In fact you do not have any rights in it during your father's lifetime.
He only can decide about all such things, legally.