seeking info Fleming family Boston, MA

trying to find out more about ggrandmother "Kate"'s parents and siblings. I found them in Boston from 1860-1880 but so far only have those censuses and daughter Catherine/Katherine "Kate" 's marriage to Edward Wyman LORD in 1902 in Boston (I have info on them after that) and her birth information..
Here's what I have thus far and questions I'm looking for answers to also. Does anyone have any good Boston/ Suffolk county research links?
Name: William Fleming
Event Type: Census
Event Date: 1880
Event Place: Boston, Suffolk, Massachusetts, United States
Gender: Male
Age: 45
Marital Status: Married
Occupation: Blacksmith
Race (Original):
Ethnicity: American
Relationship to Head of Household: Self
Birthplace: Ireland
Birth Date: 1835
Spouse's Name: Mary Fleming
Spouse's Birthplace: Ireland
Father's Name:
Father's Birthplace: Ireland
Mother's Name:
Mother's Birthplace: Ireland
Page: 456
Page Letter: D
Entry Number: 134
Affiliate Film Number: T9-0556
GS Film number: 1254556
Digital Folder Number: 004241638
Image Number: 00576
Household Gender Age Birthplace
Self William Fleming M 45 Ireland
Wife Mary Fleming F 45 Ireland
Son James Fleming M 24 New Hampshire, United States
Son John Fleming M 20 Massachusetts, United States
Daughter Johannah Fleming F 18 Massachusetts, United States
Daughter Mary A. Fleming F 12 Massachusetts, United States
Son William Fleming M 11 Massachusetts, United States
Son Nicholas Fleming M 9 Massachusetts, United States
Daughter Kate Fleming F 7 Massachusetts, United States
Other Joseph Kelly M 19 Massachusetts, United States
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1870 census, Boston ward 7:

Fleming, William, 37, machine blacksmith, born IRE.

  "       , Mary, 37, grocery?? (not sure), 200, born IRE.

    "     , James, 14, at school, born NH

    "     , Michael, 12, at school, born MA

    "     , John, 10, at school, born MA

    "     , Joanna, 8, at school, born MA

    "     , Mary A., 6, at home, born MA

    "     , William, 4, at home, born MA

    " ?   , Hannah, 20, at home, born IRE

(not sure yet IF Hannah is a daughter, or housekeeper or something)

=================================

1860 census, Boston ward 12:

Fleming, Wm, 25, laborer, 50, born IRE

    "      , Mary, 23, born IRE

    "      , James, 4, born NH

    "      , Michael, 2, born MA

    "      , John, 9/12, born MA

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so between 1870 and 1880 censuses Michael is no longer listed with family. In 1880 there is the addition of Nicholas and Kate. And there's the question of Hannah still to solve. I would think IF Hannah had indeed been born before William & Mary immigrated that since she is 20 in 1870 and James is 14 born in NH that there may have been a child or two in between them born in IRE & NH....????

Any help or thoughts much appreciated!

I just found a possible death for son James in Boston:

Name: James J. Fleming

Gender: Male
Burial Date:
Burial Place:
Death Date: 17 Aug 1880
Death Place: Boston, Sufflok, Massachusetts
Age: 24
Birth Date: 1856
Birthplace: Manchester, Nh
Occupation: Laborer
Race:
Marital Status: Single
Spouse's Name:
Father's Name: William
Father's Birthplace: Ireland
Mother's Name: Mary
Mother's Birthplace: Ireland
Indexing Project (Batch) Number: B50181-9
System Origin: Massachusetts-EASy
GS Film number: 593733
Reference ID: v 1 cn 5225
Citing this Record
"Massachusetts, Deaths and Burials, 1795-1910," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/FHSM-226 : accessed 02 Apr 2013), James J. Fleming, 17 Aug 1880.