POSSESSIVE ADJECTIVES.

43. Words like "my," "his," "your," which indicate ownership or some
possessive relation, are called "possessive adjectives". Possessive
adjectives are formed from the personal pronouns by adding the adjective
ending "-a", as "mia", my, "via", your ("cia", thy), "lia", his, "sxia",
her, "gxia", its, "nia", our, "via", your (plural), "ilia", their. The
limitation in the use of the third personal pronouns ("42") is also true
of the adjectives derived from them:

Mia domo kaj miaj gxardenoj estas grandaj,
my house and my gardens are large.
Johano sidas sur via segxo, John is sitting in your chair.
Li havas lian cxevalon, he has his (another person's) horse.
Cxu vi legis sxiajn librojn? Did you read her books?

[Footnote: Sometimes these words are called possessive pronouns,
although really they are not pronouns at all, but pronominal adjectives
with a possessive meaning.]

44. Reflexive possessive adjectives, like the reflexive pronoun, refer
to the subject of the verb in the sentence. For the first and second
persons, they are the same as the personal possessive adjectives. The
reflexive possessive adjective of the third person is "sia", his, her,
its, their, formed by adding the ending "-a" to the reflexive pronoun
"si":

Mi havas miajn librojn sur mia tablo, I have my books on my table.
Johano perdis siajn librojn, John lost his (John's) books.