The Demonstrative Pronouns.

In English the Demonstrative Pronouns are: this, that, these and those when they are NOT followed
by a noun. (that then would be a Demonstrative Adjective).
Note that the difference between this and that and these and those is one of proximity.
(this and these are the ones closer by; that and those are the ones further away).

The demonstrative pronouns in Fench agree with the nouns to which they refer,
and they are: (celui, ceux, celle, celles)

Celui and its forms are normally not used alone. In the examples below, I added
-ci for those closer by and -là for those futher away*

celles-ci (these)         J'aime celles-ci Papa. I like these Dad. (le livre)
celles-là (those)         J'aime celles-là Papa. I like those Dad. (les jupes)

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*In additon to using -ci and -là the Demonstrative pronoun can also use de or
     one of the Relative Pronouns qui, que, où and dont.

Examples:

A. Celui (ceux, etc.) with de.

1. Donnez-moi mon cahier et celui de Marianne.
   Give me my book and Marianne's (the one of Marianne)
2. Ces livres sont plus intéressant que ceux de Hemingway.
    These books are more interesting than those of Hemingway.

B. celui (ceux, etc.) with a relative pronoun:

     1. Ceux qui rient toujours sont heureux. (note: ceux qui because it's the subject)
         Those who always laugh are happy
      2.La rose qu'il lui a donné est celle que j'ai achetée. (note: ceux que because it's the object)
        The rose which he gave her is the one I bought.
      3. C'est celui dont je t'ai parlé.
          That's the one I talked to you about. (note: to talk about=parler de; hence:dont)
      4. A quelle école vas-tu? A celle où on a de belles filles
         Which school do you go to? To the one with the pretty girls.