Not sure if your brother-in-law is on AFR or AAL this evening but the planned routes for both are fairly similar. WSI is forecasting three areas of turbulence along the planned routes. The first area to the north of BDA is forecast to be light. The second area is south-southeast of New Foundland, and also light. The third and final area will be from around coast-in on the French coast through the descent into CDG. That area is forecast for light and occasional moderate. All in all, other than a few bumps here and there it should be a pretty smooth flight.