I searched to find the 1900 census for them, but I didn't find it.I did find 2 records that might be helpful.I got them on the Family Search Labs site of the Mormon Church.It is free.
Here is a second marriage record for Hannah.
Groom's Name: James Clohessy Groom's Birth Date: Groom's Birthplace: Groom's Age: Bride's Name: Hannah Murphy Pentony Bride's Birth Date: Bride's Birthplace: Bride's Age: Marriage Date: 08 Feb 1891 Marriage Place: Manhattan, New York, New York Groom's Father's Name: Robert Groom's Mother's Name: Hannah Culhane Bride's Father's Name: Michael Bride's Mother's Name: Mary Mccarthy Groom's Race: Groom's Marital Status: Groom's Previous Wife's Name: Bride's Race: Bride's Marital Status: Bride's Previous Husband's Name: Indexing Project (Batch) Number: M00593-8
System Origin: New_York-ODM Source Film Number: 1452072 Reference Number:
New York Marriages 1686-1980
This is a birth record for one of the Pentoney's children. Name: Mary Pentony Gender: Female Baptism/Christening Date: Baptism/Christening Place: Birth Date: 09 Jul 1884 Birthplace: BIRTH CERTIFICATES, MANHATTAN, NEW YORK, NEW YORK Death Date: Name Note: Race: Father's Name: John Pentony Father's Birthplace: Father's Age: Mother's Name: Hannah Murphy Mother's Birthplace: Mother's Age: Indexing Project (Batch) Number: C71515-2
System Origin: New_York-ODM Source Film Number: 1322192 Reference Number:
New York Births & Christenings, 1640-1962
I have a John Pentoney married to Mary McGuire having children in the 1770s.Is there a chance he was previously married and his wife Mary died? Sincerely, Kate