Mon ami et celui de mon frère,
Ma femme et celle de mon voisin,
Voilà mon livre, celui-ci est à vous et celui-là, est à lui,
Voilà ma chambre, celle-ci est à mon frère et celle-là, est à ma soeur.
My friend and my brother's.
My wife and my neighbor's.
Here is my book; this one is yours and that one is his.
Here is my room; this one is my brother's and that one is my sister's.

4. Ce, it, as the nominative of the verb être:

c'est moi, it is I. c'est vous, it is you.

5. The absolutes ceci, cela serve only to point out objects:

Prenez ceci, take this. Rendez-moi cela, give me that back.

§ 29. Relative Pronouns.

1. Qui, who, which (nominative). de qui, of, from whom, } genitive and
que, whom, which (accusative). dont, of, from whom; which, } ablative.
à qui, to whom (dative).

2. Singular. Plural.Masculine. Feminine. Masculine. Feminine.lequel, laquelle, lesquels, lesquelles, who, which.
duquel, de laquelle, desquels, desquelles, of, from which.
auquel, à laquelle, auxquels, auxquelles, to which.
y, to it, of it, etc. en, of it, of them, etc.
quoi, what, which, why, etc.

3. Qui stands generally for persons or things in the nominative; thus it is invariable:

Le monsieur qui entra le premier était mon père,
The gentleman who entered first was my father.