Cahill/Kelly family of Calverstown Little

Seeking info. regarding the following family.

Martin Cahill, born circa 1802, Co Kildare married Margaret Kelly, born circa
1800, possibly Inchaquire. At the time of the Primary Valuation (1852) the
family were living at the Bog Ranger's House, Calverstown Little, near Ballymount in the civil parish of
Davidstown and the catholic parish of Crookstown.

Known children all born Co Kildare were:

James Cahill, (my great-grandfather) born circa 1832. Went to America as a
young man but returned and later settled in Co Durham, England where he married
Co Sligo girl Mary Milmoe at Brooms catholic chapel, Co Durham in 1860, they
had 9 children including my grandmother Mary. James died Co Durham 1903.

Margaret Cahill, born circa 1839, married Anthony Hart at St Cuthbert's
catholic chapel, Durham City in 1864, emigrated to the US in 1866. Lived at various places within the coal fields of Pennsylvania eventually settling at Pittsburg. Had four children.

Julia Cahill, born circa 1843, married James Callaghan at St Cuthbert's
catholic chapel, Durham City in 1871, died Durham City 1898. No Children.

Thomas Cahill, born circa 1841, succeeded his father at family home, married
widow Catherine Nolan nee Brophy of Kilrush at Suncroft catholic chapel in
1886, no children, died Calverstown Little 1901. Occupation was Bog Ranger.
Last relation in ancestral home was Thomas' stepson Jack Nolan who died unmarried in the 1930's.

Marcella Cahill, born? (before 1843) married George Butler of Ballymount at
Crookstown catholic chapel in 1864. Known children, all born locally and
baptised Crookstown, Martin (1865) Bridget (1867) and Mary (1869). I am particularly interested in what become of this Butler family. May have emigrated to Australia.

There must have been at least one other Cahill sibling, as the informant on
Martin Cahill's Death cert. in 1882 was "Kate Ryan, granddaughter" I am
particularly interested in this cousin of my grandmother, who by 1882 was possibly
old enough to be married.

Finally the informant on the death cert. of Margaret Cahill, nee Kelly in
1870 was John Keegan of Inchaquire. In 1842 a John Keegan son of Christopher
Keegan and Bridget Kelly was baptised at Crookstown. Interestingly the godfather
was Martin Cahill, leading me to believe that my Kellys had a link with, or
originated from Inchaquire.

Any assistance will be gratefully appreciated
J.T.A.