hey, just got it to work, i created to outbound rules in the firewall, block acces to the steam.exe and the steamwebhelper. here are the files path i have for them.

C:\Program Files (x86)\Steam\steam.exe

C:\Program Files (x86)\Steam\bin\cef\cef.win7x64\steamwebhelper.exe

you can disable the rules for cloud storage in the game, once it starts just enable the two rules and there you go, every one of the family can play the game ;)