Lydia, the Mirror Glazing Ghost is the wife of Neville, the mother of Henry, Orville and Chauncey, and the second Portrait Ghost whom Luigi encounters in Luigi's Mansion.
In SMG4 series, she only appears in SMG4: Stupid Luigi's Mansion, where she is the first ghost that Luigi catches. When Luigi sucks her into his vacuum, her husband come in and greets Luigi, until he hear her scream in the vacuum, but it reveal that E. Gadd built a spa in the vacuum.