[Giveaways within] Looking for game suggestions.

Hey y'all! I'm looking for game suggestions, but not just any games. I'm trying to find something I can play online or over the network with my sibling and his girlfriend that's not a FPS. Minecraft and terraria have already been considered, we're definitely aiming for co-op. Any other ideas?

Now on to the fun stuff.

Fortix!
Cubemen

Nothing hidden, didn't feel like going to all that trouble. Thanks in advance for the suggestions!