1.the dslauncher clears the save files because it causes some problems...
2.you can set a server for you and your son quite easy...just run flserver from game folder/exe/ and make use of the flhook (also always shutdown the server and not close the flhook window since won't save the changes)
3.however if you plan on making an internet server(not just for family ) you will have to know that are missing some files which are not released for public use,anticheat and some others..
People want to believe that God has a plan for them.
They don't wanna believe that anyone else does..