Remember that possessive pronouns agree in gender and number with the *owned* item (son billet / sa carte / ses parents).»
In the lesson, son,sa,ses have been referred to as possessive adjectives in one line, and possessive pronouns in the line immediately following. In general throughout the course they have been referred to as 'possessive adjectives' (as in French they are always followed by the noun modified, this would seem to be correct).