Margaret McPoyle is a perfect example of It’s Always Sunny in Philadelphia ’s genius for creating grotesque, hilarious, and oddly tragic side characters. She is not just "Liam’s sister/wife"; she is a unique creature – soft, violent, lonely, and deeply wrong. Thanks to Mary Elizabeth Ellis’s fearless performance, Margaret remains a fan-favorite footnote in the show’s long history, proving that even in a family of freaks, you can stand out as something special.
The family tree is a tangled web of recursion. The matriarch, Margaret McPoyle, and her brother, Pappy McPoyle, serve as the older generation of this incestuous dynasty. Their genealogy is a geneticist's nightmare, resulting in offspring who possess a high resistance to pain but a low resistance to airborne pathogens. It is suggested that their lineage has produced a distinct lack of immune system strength, requiring them to medicate heavily and avoid the "dirty" habits of the Gang. Their physical weakness, however, belies a strange, wiry strength and a capacity for sudden, unexpected violence. margaret mcpoyles