"Our House Below" & "Nobody's Home"

There's something about these two songs:  "Our House Below", from a anime movie called Arrietty, and "Nobody's Home" by Avril Levigne (used to listen to this up till high school) that gets to me. It has me questioning two things: "Family" and "Home". Do I feel a part of a family? Do I feel like I'm home? I honestly don't know anymore... What do they both mean anyway? Because I don't think I know the meanings anymore...