When the owner is a person, you can alternatively use "de qui" as well as dont:
Les enfants, de qui je connais la maman, sont bien élevés.
The children, whose mum I know, are well behaved.Can I say thatLes enfants, de qui les pères sont riches, sont bien élevés.
The children, whose fathers are rich, are well behavedI wish your helps...Merci beaucoup
No! I don't think so.
In this case I believe that "dont" is more appropriate because you are expressing the children "of whom" I know the mother.
The children "of whom" the father is rich ....
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