It depends on your situation. We do see extended family, but it isn't often, because they aren't nearby. Even the few who are closer don't visit much because of public school schedules, sports, etc. Make sure children know that secular behavior is bad, and that you won't allow it in your home. Be strict.
The bigger challenge has been long-time trad families who are beginning to allow their teenage daughters to wear pants. It's a hard situation to deal with.