Dathai....I was able to find the actual wills if Bridget Segrave the mother and Fr. John Segrave one of the sons.. It is very exciting because the Stephen you found in the census is named as a son/ brother confirming the family members! I know we are related my best educated guess is their father Peter Segrave was my gg grandfathers uncle... And Patrick , John, Stephen Frances and others unnamed were his 1st cousins.
It was a good day! Still looking for my ggg grandfather James who I believe is Peters brother