Colreavy aka Gray

Hello, I am looking for any information on the Colreavy family; especially, Cormack Colreavy. His wife's name was Nabby.  The only children I have found are James (1836), Bridget (1838) and James(1851).  James wed Elizabeth McGowan.   As for the Bridget and James I have no other information.  Not even sure if Cormack and Nabby had other children.  I think I found Nabby's death date 17 July 1885.  It states that she died of old age( 84).  She was a widow by then, so I think she was buried with her husband.  Maybe that is how I can get information on Cormack.  Any help on any members of the family would be very helpful.  As for the aka Gray, I found that this surname was interchanged at times.  I think more so with James and Elizabeth's children. Thank you