ciao tuttiCould anyone tell me how to

For a copy of the deeds, you either need to go to the archivio notarile, if you know which Notatio or when the act of sale wascomplleted.   Failing that, you may need to go to the provincial Conservatoria of Beni Immobili - but you will need to know as much as possible first.  The lawyer is asking for the visure catastale in the hope that it will say when it was bought and who handled the sale.  You can get them online now, but you will need at least your Mums codice fiscale or anagrpagicaldetails assuming the house is in her name.  If you are the only child and have no suriving parent , it will be yours without the need for a will.  

You can get the visura online typing in visure catastale in google.  If it is still in your grandmothers name, put in her codice fiscale and the province where the property is, and it should come up.    It will be necessary to do the succession however.