+----------+---------+
| Nonno    | Nipote  |
+----------+---------+
| Amelia   | Aldo    |
| Amelia   | Marco   |
| Beatrice | Aldo    |
| Beatrice | Marco   |
| Leonardo | Aldo    |
| Leonardo | Marco   |
| Luisa    | Filippo |
| Luisa    | Olga    |
| Luisa    | Aldo    |
| Luisa    | Andrea  |
| Michele  | Aldo    |
| Michele  | Marco   |
| Sergio   | Aldo    |
| Sergio   | Andrea  |
+----------+---------+