Possessive proper noun as an adjective?

Any possessive noun serves as a limiting adjective, limiting something as belonging to a specific person or thing. Examples are:

My mother's car is new. (specifically the car of my mother)

There are towels in the boys' locker room.

We're studying China's history.

You'll find men's shoes on the second floor.

The types of limiting adjectives are:

Articles: the, a, and an.

Numerical adjectives: one, two, three, four, five, first, second, third, next, last, etc.

Pronominal adjectives (pronouns), Words that are pronouns when they take the place of a noun and are adjectives when placed just before the noun:

• possessive adjectives: my, your, our, his, her, their, its.
• demonstrative pronouns: this, that, these, those.
• interrogative pronouns: what, which, whose.
• relative pronouns: whose, which, that.
• indefinite pronouns: all, another, any, both, each, either, few, fewer, half, less, little, many, much, neither, other, some, whole.