Bernard McMahon and Ann Shields

[oldohiohome]

Michael Patrick McMahon, son of Bernard and Annie (Shields) McMahon, is said to have died 14 November 1975 in Rockaway NJ
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for 1880 you have 2 choices in Jersey City. I favor the first since the second is a carpenter and you'd think he would stay with that trade.

1880, Jersey City

Bernard, 21, working in a tobacco factory
brothers: Michael 24, Thomas 27, Daniel 30, Patrick 18
https://www.familysearch.org/ark:/61903/1:1:MN84-ZGY

or
Bernard 22, single, carpenter
brothers: Michael 35, Thomas 27, George 20
mother: Mary, 73, widowed

https://www.familysearch.org/ark:/61903/1:1:MN84-D4T

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This might be the other Bernard McMahon, dying July 1881 at age 21-22
https://www.findagrave.com/memorial/146532360/bernard-j.-mcmahon

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1900 Weehawken, Bernard McMahon and Bridget
at 1907 Boulevard Loop
Bernard: arrived 1878, naturalized, occ: liquor dealer
https://www.familysearch.org/ark:/61903/1:1:M9JL-41P

1910 in Hoboken NJ
Bernard: yardman, coal yard, arrived 1874, naturalized
https://www.familysearch.org/ark:/61903/1:1:MKY8-VR9

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this might be him, if they were buried in Jersey City:
plot K K 28, Holy Name Cemetery

Bernard McMahon d Nov 1917, age 55
https://www.findagrave.com/memorial/146532355/bernard-mcmahon
Bridget McMahon d Jun 1915, age 45
https://www.findagrave.com/memorial/146532365/bridget-mcmahon

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note there are 426 (!) people named McMahon buried in Holy Name Cemetery, Jersey City. So that is what you are up against with this family. I'm not sure any of the records are the man you are looking for, but they do all fit what you know about him.

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looked in vain for Katherine McMahon, b Sep 1883, England, who is with Bernard and Bridget in 1900. She would be the daughter of Bernard and a 1st wife who must have died somewhere before he married Annie Shields. Katherine's immigration information in 1900 said she arrived in 1886.

---> Wait a minute. Bernard might be neither of those men in Jersey City in 1880 if Katherine is his daughter and was born in England in 1883.
Something doesn't fit about the 1900 census. Bernard says he arrived in the US in 1878, but Katherine was born in 1883. Maybe it is Katherine who doesn't fit with everything else, not the 1880 info for Bernard. 

[oldohiohome]

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this might be him, if they were buried in Jersey City:
plot K K 28, Holy Name Cemetery

Bernard McMahon d Nov 1917, age 55
https://www.findagrave.com/memorial/146532355/bernard-mcmahon
Bridget McMahon d Jun 1915, age 45
https://www.findagrave.com/memorial/146532365/bridget-mcmahon

Supporting the idea that this is the right Bernard and Bridget - their son John Joseph McMahon's WWI Draft Reg. said he was supporting his father and sister. no mention of supporting his mother:
https://www.familysearch.org/ark:/61903/1:1:KZJN-LNY

[oldohiohome]

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looked in vain for Katherine McMahon, b Sep 1883, England, who is with Bernard and Bridget in 1900...

I forgot. I did find this. A tree said she married a man named Hanford "Jack" Little and had 3 children, Katherine, Bernard, and Dorothy. So this might be Dorothy:

Dorothy Little
b 1905 Newburgh, NY to John Little and Kathrine McMahon
m 20 Sep 1929, Manhattan, to Clifton Foote

https://www.familysearch.org/ark:/61903/1:1:248S-JVS

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but nothing else for Katherine (McMahon) Little. I was hoping to find her mother's name. She is not: Kate M Little, obit dated 23 August 1978, Orlando, Florida, as a tree thinks. That woman spent her life in the Southern US. I forget the details.

[Ella McMahon]

Hello oldohiohome and Sandra,

Thank you so much for being so generous with your time and for all the work that you have put into answering this post.  I could not believe my eyes when I checked earlier.  I'm pretty amazed by your efforts and kindness.  Sincerest thanks, Ella.

[oldohiohome]

You are very welcome.