Issabell's father was Sir Roger Mortein. She was an only child. Issabell is no longer alive.
General Notes
The Visitation of the County of Nottingham In the Years 1569 and 1614, edited by G.W. Marshall 1871, Publications of the Harleian Society, vol. 4, p. 145. Issabell daughter of Sir Roger Mortein Knight Lord of Dunesley.