While its not very warm in Germany at the moment there are still plenty of reasons to visit in February such as

Less visitors means less lines for tourist spots
Cheap hotel rates due to lower demand
The same goes for car hire Germany deals with lots of bargains currently available
Flights are also plentiful with lots of budget airline deals
The snow and ice actually combines for some stunning scenery

Don’t rule out Germany because of the cold snap. There are still plenty of great family holiday options available.