Sounds like the early stages of car cancer. It's very common on older French people carriers. It starts in the driver's side door lock and then spreads to other areas of the car, it can be treated but there are serious side effects. If left it will destroy the car from within and eventually the car will explode when you and your family are driving along, killing all of you.
If I were you I'd take the car to Switzerland and have it humanely crushed. It's for the best.