Heirs with fixed shares are: the husband, the wife, the father, the mother, the paternal grandfather, even if he ascends, the grandmother, the daughter, the son’s daughter, and so on, through purely male descendants, whether she is one or more, the full sister, the paternal sister, the maternal brother, and the maternal sister, whether they are one or more.
Interpretation and application must be checked against the official text and current version.