Learn Italian: Voi avete il libro di mio suocero? - Do you have my father-in-law's book?

In Italian, you usually put a definite article (like il or la) before a possessive word. However, there is a special rule for family members: when referring to a single family member (like a father-in-law, mother, or brother) with words like mio, tuo, or suo, you drop the article. That's why it is just mio suocero.

Why do we say il libro di mio suocero instead of mio suocero's libro?

Italian doesn't use an apostrophe 's' to show ownership like English does. Instead, it always uses the preposition di (of) to link the object to its owner. So, you must phrase it literally as 'the book of my father-in-law' (il libro di mio suocero).

Do I have to use the word Voi at the beginning of the sentence?

No, you can simply ask Avete il libro di mio suocero? In Italian, the verb form avete already tells us that the subject is the plural 'you' (voi). Including the pronoun is optional and just adds a bit of emphasis, like asking 'Do you guys have the book?'

What would happen if we were talking about my parents-in-law in the plural?

If you make the family member plural, the normal grammar rule comes back and you must use the article. 'My parents-in-law' would be i miei suoceri. The special 'no article' rule only ever applies to singular family members.