Re: John McGeady (b. 1840-45, ? Pennsylvania
The Easton Area Public Library has an excellent selection of Northampton County records. They might be able to find a death date and obit for John. If he died before 1906 his death might have been recorded at the Northampton County Register of Wills Office. It should have where he was buried and possibly other helpful data. If he died after 1905 the PA Dept of Health would have his death certificate. Bridget's death certificate should have her parents' names. If not her children's death certificates should have her maiden name as might their obits.
I suggest checking with the cemetery office to see what they may have in their records including who else was buried in the same plot as Alice:http://www.findagrave.com/cgi-bin/fg.cgi?page=cr&GSln=mcg&GSiman=1&GScid=688836&CRid=688836&pt=Immaculate%20Conception%20Catholic%20Cemetery&
The Lehigh County Historical Society has on its website listing the Immaculate Conception Cemetery records as one of the records it has. It might be a tombstone transcription or burial records.
Check with the church they were members of. Their records could have lots of helpful data. If you don't which church check with the Allentown Diocese to see if they can help you.