Are you still interested in your ancestors of the Fourny family or did you already figure it out by yourself? I did some look-ups and found some ancestors of Emile Joseph Fourny till around 1760( with scans of birth certificates etc. ). Your great-grandfather Emile Joseph Fourny had 2 brothers and 4 sisters, Edouard Lucien, Hélène, Aline, Louis Joseph, Lucie Juliette and Marie Hélène of which Hélène and Marie you've already mentioned in your request. I can mail you all these findings if you transmit me your e-mail address, o.k. ?