After 1909, the two brothers ended their collaboration, and Joseph Boex took to signing his works as J.-H. Rosny aîné (J. H. Rosny Sr.), while his brother Seraphin used the name J.-H. Rosny jeune.
After they ended their collaboration Joseph Boex continued to write under the name "Rosny aîné" (Rosny the Elder) while his brother used J.-H. Rosny jeune (Rosny the Younger).
Rosny-sous-Bois | Rosny Park, Tasmania | Rosny Park | Jeune Afrique | Claude Le Jeune | Rosny, Tasmania | Rosny | Le Jeune Werther | J.-H. Rosny jeune | Rosny-sur-Seine | Rosny Smarth | J.-H. Rosny aîné | Jean-Marie-Raphaël Le Jeune |