Definition: Possessive adjectives differ depending on the person they are referring to. Possessive adjectives are the words used in place of articles to indicate to whom or to what something belongs. also with the noun they qualify in gender and number.
There are five possessive adjectives in gender: masculine and feminine.
my
mi, mis
your
tu, tus
his, her, your, its, their
su, sus
our
nuestro, nuestra, nuestros, nuestras
your
vuestro, vuestra, vuestros, vuestras
Examples in Spanish:
my book is big mi libro es grande
my books are big mis libros son grandes
your book is red tu libro es rook
your book are red tus libros son rojos
His / Her / Your (formal) brother is here su hermano está aqui
His / Her / Your sisters are here sus hermanas están aqui
Our book is interesting nuestro libro es interesante
Our books are interesting nuestros libros son interesantes
Our sister lives in spain nuestra hermana vive en españa
Our sisters live in spain nuestras hermanas viven en España