This is the 1910 Census of the O'Hara living at 527 Baltic St. They're the last family on the page. Since we've last seen them, we know they've returned to Ireland and then come back again. We know this through family stories - Grandpa JJ telling us that he got teased for his Irish accent when he got back, and that his last memory of Ireland was being sent up the hill to the post office to mail a letter. We also know that Patrick was born there, though that is (incorrectly) not evident on this census.
The family is listed as John, 41; Mary, 35 (she's only aged about 8 years in the last 10); John Jr., 13; Eugene, whose age is hard to read, but who should be about 11; Patrick, 8; and Malinda, 6. There are also "boarders," John and Martin King, though I'm nearly certain that these are Mary's brothers.
The younger sister Mary is not on this census. I plan to post her death certificate next; I know this girl existed. Why isn't she on the census now? She should be about 2, and won't die (of Pneumonia) for another year. Her baptismal record also wasn't on file at St. Augustine's which it should have been, since she was born while they were living in the area (unless they moved out and back within 5 years, which, of course, is not impossible). I know she lived a short life, a mere three years, but there should still be more evidence of her existence than her death certificate and a memory passed on through Uncle Jack and Uncle Ted. Mary the mother is also listed as having only given birth to 4 children, which simply isn't true, unless her age was misrecorded on her death certificate (the difference between being 1 year old and being 3 years old is huge).
All the adults are listed as having been born in Ireland, while all the children are listed as having been born in NY, although this is not true; we know Patrick was born in Ireland. Now John and Mary both say they immigrated in 1891, which is different from the answer they gave ten years ago. John has been naturalized (Mary probably is, too, by marriage, though I'm not sure of the laws relating to this at the time). John and Martin King say they immigrated (possibly together?) in 1907, and are not naturalized. John O'Hara is listed as a stableman at a livery stable (which is similar to his earlier occupation of coachman), while John King is an Engineer for a Gas Co. and Martin is a fireman at a Gas Co. All the kids had attended school in the past year, except for Malinda. They rent their home.