Spanish Possessive Adjectives: Mi, Tu, Su

You're showing a new friend in Lima a photo of your sister and her two kids, and you say "Mi hermana y su hijos." Your friend nods, but something sounded off. Spanish possessive adjectives (mi, tu, su and friends) look easy until you realize they follow a rule English speakers never have to think about.

Why Spanish Possessive Adjectives Trip People Up

In English, "my" and "your" never change. In Spanish, possessive adjectives are small words that change form depending on what is owned, not on who owns it. That one idea is behind most of the mistakes learners make, along with the famously vague word su, which can mean five or six different things.

If you're traveling, introducing your family, or writing a message to a colleague, you'll use possessives constantly: my phone, your name, our flight. Getting them right makes you sound natural very quickly. This guide covers the short forms you'll use every day, the tricky nuestro family, how to clear up a confusing su, and the longer forms you'll meet in songs and writing.

The Short Forms: Mi, Tu, Su

The short possessives go before the noun, just like "my book" in English. Most of them only care whether the thing owned is singular or plural.

Key Phrases

• mi / mis (mee / mees) — my
• tu / tus (too / toos) — your (informal, one person)
• su / sus (soo / soos) — his, her, its, your (formal), their, your (plural)
• mi casa (mee KAH-sah) — my house
• mis amigos (mees ah-MEE-gohs) — my friends
• tus llaves (toos YAH-vehs) — your keys
• su familia (soo fah-MEE-lyah) — his/her/their family

Grammar Note

Look at the thing owned, then match it. One house is mi casa; two houses are mis casas. It does not matter whether the owner is a man or a woman, one person or ten, so su works for "his dog" and "their dog" alike.

• Mi libro (my book), mis libros (my books)
• Tu hermano (your brother), tus hermanos (your brothers or siblings)
• Mistake: mi hermanos → correct: mis hermanos
• Mistake: mis casa → correct: mi casa

So in the opening example, "su hijos" should be "sus hijos", because there is more than one child.

A small accent mark changes everything: tu (your) has no accent, while tú (you) does, and mi (my) differs from mí (me, as in para mí). Careful writers keep these accents, but in text messages people drop them constantly, so context is your friend.

Nuestro and Vuestro: The Ones That Change Gender

Two possessives behave differently because they also match the gender of the thing owned. They have four forms each, like adjectives ending in -o.

• nuestro / nuestra / nuestros / nuestras — our
• vuestro / vuestra / vuestros / vuestras — your (plural, informal, used in Spain)

So you say nuestro coche (our car, Spain) or nuestro carro (Latin America), but nuestra casa (our house) and nuestras vacaciones (our vacation). The gender comes from casa, which is feminine, not from the people who own it.

Vuestro belongs to vosotros, the informal "you all" used in Spain. Across Latin America, people say ustedes for "you all" and use su or sus instead, so you can safely skip vuestro unless you're heading to Madrid or Seville.

Clearing Up the Confusing Su

Because su can mean his, her, your (formal), their, or your (plural), it can get ambiguous. If someone says "Vi a Ana con su hermano," whose brother is it? Ana's, or the speaker's friend's?

When context doesn't settle it, Spanish speakers swap in a clearer phrase using de:

• el libro de él — his book
• el libro de ella — her book
• el libro de usted — your book (formal)
• el libro de ellos — their book
• la casa de Ana — Ana's house

Notice there is no apostrophe-s in Spanish. To say "Ana's house," you literally say "the house of Ana." The same pattern works for any owner: el perro de mi vecina (my neighbor's dog).

In everyday speech across Latin America, plain su is extremely common and people lean on context to know who is meant. The de él / de ella versions mostly appear when a misunderstanding is genuinely possible, so don't feel you must avoid su altogether.

Long Forms: Mío, Tuyo, Suyo

Spanish has a second set of possessives that go after the noun, or stand alone as pronouns. You'll hear them in songs, in emphatic speech, and in the phrase "¡Dios mío!" (my God!).

Key Phrases

• mío / mía (MEE-oh / MEE-ah) — mine
• tuyo / tuya (TOO-yoh / TOO-yah) — yours
• suyo / suya (SOO-yoh / SOO-yah) — his, hers, theirs
• un amigo mío (oon ah-MEE-goh MEE-oh) — a friend of mine
• ¿Es tuyo? (ehs TOO-yoh) — Is it yours?

These forms agree with the thing owned in gender and number, so los zapatos son míos (the shoes are mine) but las llaves son mías (the keys are mine). Use them when you want to stress ownership: "¡Ese asiento es mío!" (That seat is mine!).

Practical Application

Here is a real exchange you might have meeting a coworker's family at a party:

• "Esta es mi esposa, Laura, y estos son nuestros hijos."
• "Mucho gusto. ¿Es suyo ese carro?" (using the formal usted)
• "No, es de mi hermano. El nuestro está en el taller."

Notice how each possessive matches the noun that follows it. When you speak, pause for half a second and ask: "What am I owning, and is it singular, plural, masculine, or feminine?"

Practice Exercises

• Fill in the blank: Ellos venden ___ casa. (their)
• Fill in the blank: Ana lava ___ coche. (her)
• Choose the right form: Tengo dos hermanas. (Mi / Mis) hermanas son simpáticas.
• Translate: Our friends are in Spain.
• Translate: That book is mine.
• Rewrite to make clear whose it is: Es su coche. (it is Ana's)

Answer Key

• su casa
• su coche
• Mis hermanas son simpáticas.
• Nuestros amigos están en España.
• Ese libro es mío.
• Es el coche de Ana.

Conclusion

Spanish possessive adjectives are simpler than they first look once you remember the golden rule. Here are the key takeaways:

• Short forms (mi, tu, su) agree in number with the thing owned, and go before the noun.
• Nuestro and vuestro also agree in gender, and su can be clarified with de él, de ella, de usted, de ellos.
• Long forms (mío, tuyo, suyo) come after the noun and are great for emphasis.

Ready to practice? Try describing your own family and your home out loud using at least five possessives, then compare notes with a language partner. If you'd like to keep building, our lesson on family vocabulary is a perfect next step.