You can also create a tent solo, then upgrade the firepit with 3 wood. Click campfire to get options, rename the tent, then create a map to it. Share map with other characters and they can see it. Be careful sharing tents though, and be careful where you leave those maps (or throw them into fire to destroy them). 10 tents per character means you and your brother, with only 1 character each, can have 20 safe places on whole map, shared. Add new characters? They can read those same maps too so you won't have to start over.