The couple and a young child were on a free trip
to the Musee d'Orsay with a charity that supports hard-up families.
As the group browsed a room with paintings by Van Gogh, security guards told them they had to leave the building because people were "complaining about their smell".
The worker with the Act for Dignity charity said: "I argued with the security man, telling him the family were all decent and properly dressed.
"Not a single other person had complained about us so I refute the idea that it was their smell.
"We moved on to another room, but we were again met by four museum guards who ordered us out of the building."