So, our ransacked triplex birdhouse has been repaired to include smaller entry holes for the sparrows. The sparrows have moved back in and are busily making their homes. The thug-like mockingbirds came back to raid again but were only able to stuff their fat heads into the holes. The sparrows win!
I suppose we’ll look into another bird housing unit for the mockingbirds now, since we have plenty of reclaimed wood around here.