Series consists of letters sent between and to various members of the Magrath family. The bulk of the series (files 1 to 8) consists of letters send from his siblings and father to Charles Magrath. Of these, most were sent to Charles in Dublin during a single trip to administer some family land in Ireland.
Letters between Magrath family members largely concern family affairs, circumstances at Erindale and in the surrounding community, and family business and finances. Only one letter (to the Reverend Magrath) dates to the period before the family's immigration to Canada. There are a small number of professional or business letters.
Note that the Magrath family correspondence includes references to the Indigenous (Anishinaabe) people of the Credit area at that time referred to as the Credit Indians. The nature of these references is influenced by the perspective and prejudices of the Magraths.