That is very interesting - my grandmother was married to a Larre and her husbands nephew was Rene Larre - director of finance for France and Rene Larre spent alot of time in Washington D.C. also.
I will put together information for you on the tree and email you directly. I can send you photos also of the house in Hyeres and photos. I still have to find out about the children of Pierre Paul - possibly one of them is responsible for the book 1939-1945 Lyon which was a photo journalism book on the occupatin of Lyon. I will try to start on this tomorrow but may take me a couple of weeks to get this to you.