The only thing we know for sure, per the movie, is in a deleted scene, after Connie's wedding, when Vito and his sons visit the dying Genco in hospital. Vito asks Michael what his plans are, and Michael, obviously uncomfortable, says, "Finish school." Vito says he approves, and tells Michael to come to him after graduation. Michael turns away from Vito.


Ntra la porta tua lu sangu � sparsu,
E nun me mporta si ce muoru accisu...
E s'iddu muoru e vaju mparadisu
Si nun ce truovo a ttia, mancu ce trasu.