Based on personal experience with Germany, if your dependents are not command sponsored then they are tourists and there are rules on length of stay. Max of 90 days at a time within the Schengen area. I can't remember how long they have to leave for but google is your friend.
For example, once the military member departs the country for PCS or 365 (without a follow on back to Germany) then your dependents have 90 days to leave. Going to another Schengen country for a few days and coming back does not count ( happened to the spouse of a friend of mine). She was detained by the Germans, given a limited amount of time to get HHGs packed and sent on her way, but only after threats to prosecute.
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