How do you get rid of the hardened wall in virtual families'?

To get rid of the hardened wall in Virtual Families, you need to use the hammer tool. Simply select the hammer from your toolbox and then tap on the hardened wall to break it down. Once it's destroyed, you can proceed to build or modify your house as desired. Remember, this action may require a specific amount of time to complete, so be patient while your character works on it.