This article contains information about a subject that is unrelated to the Super Mario games and is therefore non-canon to the main storyline.
Patty is an orphaned girl who appears in the The Super Mario Bros. Super Show! live action segment "Day of the Orphan." She shows up at Mario Bros. Plumbing as a guest, and Mario and Luigi allow her to have a stay at their place. However, Patty's parents show up at the end and force her to confess that she is not an orphaned child.