Unfortunately, it is likely that the same thing that happened in
this thread happened to your game.
Unpredictable results can occur if adjustments are made to the clock, especially moving the clock backwards in time. Different games will respond differently under those circumstances, ranging from minor statistics anomalies to killing whatever is living in the game. Virtual Families 2: Our Dream House has a much more complex real-time engine than some of our other games, and you're much more likely to see problems with it when adjusting the system clock.
While many people do adjust their system clocks for various reasons, doing so affects far more than just the games. Every application in your device is affected, including the file system and other system applications.
There are a couple of ways to resolve the problem:
1) If you have invested a lot of time playing the game or have spent real money on In-App Purchases, you should wait it out and see if the game recovers on its own. This will usually happen when the actual time on your device "catches up" with the furthest date/time that you set during your clock adjustments. Pausing the game while you wait for that to happen can make the wait easier.
2) If you are just starting out in the game, and you haven't spent any real money on In-App Purchases, you could just delete the game, reinstall it, and start over. Everything will be erased, including all progress you had made in the game, and you will start the game completely over.