I always play my legacy family but I do drop in to other families from time to time and only for a short time to tweek the odd thing and it doesnt affect my game too much. BUT remember, that's just how I play so my word isn't the gospel truth.
You won't need to be in the Goth house long. Play the house, cheat the points, buy it, drink and leave in under a sim hour haha.
If you are worried, save your game before you change anything. Do what you need to at the Goth house, try it but don't save anything until you are sure you are happy i.e, just go to manage world rather than save and go to manage world etc. If you hate it, exit without saving and return when you reload the game etc, it will be as before you changed anything. That make sense? Lol