Hi,this is what I know about the sisters:
mother and father are Hugh and Jennie(Miller).
Mary was born 1868 married to Dugald McMillen in Windsor Canada(the scottish connection could be correct as her husband)seems to have a scottish name
Sarah was born 1865 married to Joseph H. Brown 6 Dec 1889 Windsor,same place as her sister above.
Do you know if there were any more brothers and sisters as I have found a John McIlfatrick whose father is listed as Hugh at his wedding in 2nd Kilrea Church in1876?
There does not seem to any records of the sisters in Kilrea, a Hugh shows up at 1st Kilrea church records on 11th October 1828 in Candidates for Communion 1825-1838.
Sometimes the name can be spelt wrong,try Mcelfatrick,Mcefatrick, or even Kilpatrick.
How did you find Hugh in Scotland as wondering if is descended from John who went from Ireland to Glasgow,whose father was also called Hugh born 1790?
Lastly do you know if Mary had an illegitimate son called Samuel born 1881 as his mother is listed as Mary McIlfatrick?
Hope this helps.