Sorry but I think that possible Irish link discovered by ballydw could be wrong. William Riley was probably Margaret's brother and his parents appear to be John Riley and Charlotte Ware this is the baptism:-
Name: Gulielmus Reilly (William Riley)
Birth Date: 19 Sep 1877
Baptism Date: 25 Sep 1877
Parish: St Alban's RC Church
Father's Name: Joannis Reilly (John Riley)
Mother's name: Charlotta Ware (Charlotte Ware)
Address: 47 Paget Street
This appears to be the Margaret who married Ephraim Lockhart with her family on the 1871 Census:-
28 Paget Street
Piece: 3765 Folio: 70
John Reilly, 40, Labourer, Ireland
Charlotte Reilly, 38, Ireland
Emily Reilly, 7, Ireland
Margaret Reilly, 5, Ireland
Henrietta Reilly, 2 months, Liverpool Lancashire
This appears to be Charlotte Ware's baptism in Dublin in 1833:-
http://churchrecords.irishgenealogy.ie/churchrecords/details/0ddf880321678This is the eldest daughter from the 1871 Census:-
Name: Charlotte Emily Reilly
Gender: Female
Birth Date: 3 Apr 1864
Birth Place: Dublin, Dublin, Ireland
Father's Name: John Reilly
Mother's name: Charlotte Ware
https://familysearch.org/pal:/MM9.1.1/FRQG-WY1This is Margaret Reilly who married Ephraim Lockhart:-
Name: Margaret Reilly
Gender: Female
Birth Date: 14 Jun 1866
Birth Place: Dublin, Dublin, Ireland
Father's Name: John Reilly
Mother's name: Charlotte Wyer
https://familysearch.org/pal:/MM9.1.1/F52D-PSDJohn Reilly and Charlotte Ware/Weir/Wyer appear to have married in 1864:-
Marriage Index
Name: Charlotte Weir
Date of Registration: 1864
Registration district: Dublin North
Volume: 2 Page Number: 615
FHL Film Number: 101249
Possible matches:-
John Reilly
James Johnson
John Abbey
Francis Henry Clayton
Blue