Julienne Sassou Nguesso, 50, and her 53-year-old husband Guy Johnson were placed under investigation this week for "money laundering and misuse of public funds", the sources told AFP.
Already in March, the nephew of the Congo-Brazzaville president, Wilfrid Nguesso, was placed under investigation on the same counts.
The development is part of a series of inquiries by the French authorities into the assets of three African presidential families that began in 2010.
French investigators have been looking into the entire Nguesso clan as well as relatives of Gabon's late president Omar Bongo and his son, the current ruler, and President Teodoro Obiang Nguema of Equatorial Guinea.
The trial sets a precedent for France which has long turned a blind eye to African dictators parking ill-gotten gains in Parisian real estate and luxury products.
The trial came about after nearly a decade of lobbying by activist groups Sherpa and Transparance International.
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