My father expired an year back. Our 15 year old car is now due for renewal of registration. On contacting RT office, by my mother 80 yrs old, they demand a legal heir certificate from a civil court. My mother possesses a registered will written by jointly by my parents state that our belongings and properties will go to the survivor if one expires. We three children are not having any dispute regarding the transfer of ownership. My mother started getting family pension of my father. Now she is unable to use our car as its registration is expiring in this week.
Is it really required to produce a legal heir certificate in this case just for renewing the registration? If yes, which court should I apply? How difficult to get this?