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1870 Census page1   Page 2 he is living with John and Ellen not sure what street, I need to go back to the City Directory for 1869 and 1870 and see if
Matthew was listed prior to 1870.
In 1870 Census it says that Matthew is 50 years old and Ann is 26 years old. I think that Matthew is 40 and is Ellen's brother not her father.

From the Syracuse City Directories
      Year                         Lally, Matthew               Murphy, John
    1871 -1872        138 Orange, Laborer            137 Grape
    1872 - 1873        138 Orange, Laborer            95 Mulberry, Carpenter
    1873 -1874        138 Orange, Laborer             95 Mulberry, Carpenter
    1874 - 1875        138 Orange St, Laborer        95 Mulberry, Carpenter
    1875 - 1876        138 Orange St, Laborer        95 Mulberry, Carpenter
    1876 -1877        138 Orange, Laborer             95 Mulberry, Carpenter
    1877 - 1878        53 E Adams, Laborer            95 Mulberry, Carpenter
    1878 -1879        53 E Adams, Laborer             95 Mulberry, Carpenter
    1879 - 1880        52  Adams,laborer                95 Mulberry, Carpenter

1880 Census This shows that Matthew is still 50 and Ann is now 40. and is listed as his wife.  Going through the City Directory there was NO other
Matthew Lally in Syracuse for these years.  

From the Syracuse City Directories
           Year        Lally, Matthew                    Murphy, John
    1880 - 1881        No Listing                     95 Mulberry, Carpenter
    1881- 1882        No Listing                      95 Mulberry, Carpenter
    1882 - 1883        No Listing                     95 Mulberry
    1883 -1884        No Listing                      95 Mulberry
    1884 - 1885        55 Adams, laborer         95 Mulberry
    1885 - 1886        152 Mulberry                 95 Mulberry
    1886 - 1887        95 Mulberry                   95 Mulberry
    1887 -1888        95 Mulberry                    95 Mulberry
    1888 - 1889        95 Mulberry                   95 Mulberry
    1889 - 1890        95 Mulberry                   817 Mulberry

Notice:  Matthew Lally  is not listed in the directory for
1880 -  1884 and then he shows back up again between 1884 - and 1886. Then he shows back  up with
John between 1886 and 1889. It is very possible that Matthew was not really living at 95 Mulberry in 89-90 since John had moved and Matthew disappears from the
directory again after that.

I asked the Syracuse Library to search for his death between 1889 - 1892 and they searched 1887-1895 and Matthew is not listed in the NYS Death Index for
those years.
Questions:
   1. Did he move back in with John in 1886 because Ann died?  7/31/10 - Yes he did Ann died 6/2/1884.
            (John and Ellen had a house full of kids so it would have been very crowded for him
and Ann to move in)
    2. Did he go back to Ireland between 1880 and 1885 then come back again?
    3.  Did he go back to Ireland again in 1890 (if he was 40 years old in 1870 he would have been 60 years old in 1890).   
    4.  When did Mary Mangin Lally die?  Did she die here or did she die in Ireland?
Matthew Lally Research  
The 1880 Census Ann Lally is 40 and now 4 years later she is 60 years old.  If she
was 60 in 1884 that means that she was born in 1824. 1870 she was really 46.  And in
1880 she was 56. And since she was listed as Matthew's wife Mary Mangin must
have died prior to 1870 .
I am requesting her Death Cert to see what it says