In French, to express "whose", you use the relative pronoun "dont".
How to use "dont" in French
Look at these sentences using the pronoun dont:
Une fille dontle frère travaillait avec moi...A girl whose brother used to work with me ...
J'ai rencontré cet acteur dont le nom me dit quelque chose...I met this actor whose name rings a bell ...
Tu as jeté la chaussure dontle talon est cassé.You threw away the shoe with the broken heel [lit. whose heel is broken].
Note that the construction with dont is similar to the one with whose in English. Although whose tends to be less used with inanimate objects in English, dont is actually the idiomatic way to express this in French.
In French, dont replaces the possessive expression possession + de:
La sœurde Marc -> Marc, dontla sœur est journaliste, ...
Marc's sister -> Marc, whose sister is a journalist, ....
Unlike in English, you can find cases when dont and the possession are separated by a verb, for example:
François, dont j'ai rencontré la femme le mois dernier.François, whose wife I met last month.
When the owner is a person, you can alternatively use de quias well as dont: however de qui is much less common and doesn't sound nearly as good in French.
Les enfants, de qui je connais la maman, sont bien élevés.The children, whose mum I know, are well behaved.
In the context of possession(whose), you won't use duquel, de laquelle, desquels nor desquelles.