Justin McCarthy had son Justin, daughters Catherine, Rosetta,and Mary. Catherine married Edward Butler 1825.
Family tradition is that Justin McCarthy senior had estates in Martinique which he sold in 1810/11.
In his will of 1822, he mentions a brother Daniel(deceased at that time) and Patrick, living in Waterford. He also mentions his sisters but not by name.
This branch of McCarthy is the 'Springhill' Branch. Justin the son, lived in St Stephens green in the 1840s. He married Sarah McMahon.