Minecraft LAN (local multiplayer)

Hello,

I wan't to report a problem I met in the game. I bought the game twice for me and my brother on 2 respective accounts. We are connected at the same WiFi connexion at home. I enter my world and open the LAN to make it possible for him to join but each time I do it, it doesn't works. Please solve my problem I don't wan't to have bought the game twice for nothing.

 

Thanks