Yes, it was the uncle, so it's a money family, money comes from the previous generation. They don't ever mention their jobs in the film, but in the novelization the mom was a fashion designer, but that's something the author made up on account of all the mannequins. He made the dad a businessman because it was a safe bet.
It was a throwaway line early in the film. The uncle paid for plane tickets for all the family members to come see him in Paris, and IIRC the adults were flown first class while the kids were flown coach.