Some House to Watch Over Me

"Obviously, her responsibilities meant that by the time Mirabel was 7, she was spending her days alone in a big, sentient house with whom she alone could simply and clearly bilaterally communicate. Over time small things built up." In other universes, some part of the family takes over as guardians if Julietta and Agustine drop the ball. But... What if Mirabel only had the house, would it be enough?