I've heard that both ceux(and all of its forms) and lesquels(and all of its forms) means the one. So, how do you differentiate? For example: Eva aime mes biscuits mais déteste ceux de sa tante.
The following depending upon context:-
Ceux -- the ones / those / those ones
Lesquels -- which / who
Recommend you have a look at the Wordreference site https://www.wordreference.com/
This will help you in the future with questions like this.
Hope this helps.
Grammatically speaking, "ceux" is a demonstrative pronoun and "lesquels/lesquelles" is a relative pronoun.
Les gens, parmi lesquels tu te trouves, sont des amis. -- The people, among whom you find yourself, are friends. In this example, "lesquels" is a relative pronoun substituting for "les gens".
Quels livres vous préférez? Ceux-ci ou ceux-là? -- Which books do you prefer? These or those? This shows clearly that ceux is used as a demonstrative pronoun. It can never stand for a relative pronoun.
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