I am also searching for relatives of Cormac, born in Brierfield, Ireland in ca1800, died 19 June 1847, married to Mary Glynn born ca1800 in Brierfield also. Cormac died with Mary and two children during the "fever." He is buried in Killererin Cemetery in Killererin Parish due east of Tuam Parish and due north of Abbeyknockmoy Parish. Cormac's son Patrick Glynn was born 1 September 1823, married to Margaret Shea, children: Michael, Edward, Nicholas.
I am your husband's cousin, Howard Williams, and will call you with our latest info!