Intro
There was a couple named Michael and Sarah (nee Taylor) Cassidy, living in Philadelphia, PA, USA, in the latter half of 1800s. Michael and Sarah (nee Taylor) Cassidy are relevant to my family research effort as they had a daughter that married a man named Michael Thomas Morrissey, Jr.. Michael Thomas Morrissey, Jr. was a son of my great aunt and great uncle Margaret (nee Flynn) and Michael Thomas Morrissey.

Offspring
Michael and Sarah (nee Taylor) Cassidy had at least one child that I am aware of. That one child was their daughter Sarah Cassidy.