Hi Tom have added the link to your previous search for Sarah Ellen so that others can view the
information
http://www.rootschat.com/forum/index.php?topic=378800.10
Also, if this helps, James Thomas Cahill's brother was, I believe Richard. In the 1901 census he was married to Mary at 21 Ascot Street Liverpool with children Thomas, Rosanna, Sarah Mary C and Margaret. The Ascot St connection lives on !!
Is this the baptism of James & Richard?
Jacobus Cahill Birth Date: 17 Jul 1866
Baptism Date: 29 Jul 1866 St Michael, Lancashire, England
Father's Name: Thoma Cahill Mother's name: Birgetta Reordan
Sponsors Joannis & Maria Cahill
Richard Cahill Birth Date: 28 Sep 1868
Baptism Date: 4 Oct 1868 St Anthony's, Lancashire, England
Father's Name: Thomas Cahill Mother's name: Brigidae Brenton
Sponsors Richard & Sara Starth?
1871c RG10; Piece: 3814; Folio: 132; Page: 33
Bridget widow 30 Ireland , James 4 & Richard Cahill 2 Liverpool
Not sure if this has anything to do with your Cahill family but posting because of the name
Burial25 Nov 1894 Ford Cemetery
Sarah Ellen Cahill age 5 hours ,
Residence 4 Siddons St
FindMyPast
http://www.findmypast.co.uk/ shows the address for 1891c
4 Siddons St Litherland West Derby Lancashire