This census shows Julia and Patrick Mulvaney and their family living at 270 Van Brunt St. in 1900. Patrick says he was born in April of 1863, and is 36; Julia says she was born in May 1869 and is 31 (note that this is in keeping with the age she generally states throughout her life, but not with the age she would be if she were the Julia Toner from the 1860 census we've looked at). This time, they appear to have been married to each other for the same number of years, which is 7, giving them an approximate marriage date of around 1893. Julia has given birth to 4 children, all still living at this point. Both were born in New York, and all of their parents were from Ireland. Their home is rented, not owned, and both can read, write, and speak English. Patrick's occupation is "Machinist." Their four children are John, 6 (b. 01/1894), Grace, 4 (b. 08/1896), James, 3 (b. 08/1897), and William, 1 (b. 08/1899). John shows up on the census only this once; he presumably died young, before the 1910 census, in which he would have been 16. He has been attending school for 10 months, the only one of his siblings to do so so far. Grace's birthdate here is fairly consistent with what is later recorded. Interestingly, though, she continues to be listed as the second oldest on later censuses. Most ages that we see given for James make him 2-4 years older than he is said to be here, giving him a birthdate closer to John's and making him appear to be Grace's older brother, not her younger brother. Willie's birthdate is later listed as being as late as 1902, making him a solid 3 years younger than he should be here.
They have two boarders, who are not the nephews living with them in 1910. These, apparently two brothers, are James and John McGuirre (McGuine?), ages 34 and 31. Both are American-born, and James, too, is listed as a machinist. One wonders if he met Patrick at work, and was offered a place to live, or perhaps was an unemployed boarder for whom Patrick found a job? John is a chair-maker.
UPDATE: While my wonderings above about the McGuirre brothers still apply, they may have been something more than just boarders. I came home this weekend for my mom's birthday, and was looking through the family papers I have at home. Betty and John had sent me photocopies of Julia and Patrick's marriage certificate (9 April 1893 at the Church of the Visitation of the Blessed Virgin Mary) and of the certification of Auntie Mae's baptism, also at Visitation Church. Auntie Mae, it says, was born 18 January 1897, and baptized 4 February 1897. (Why she doesn't show up on this census is a mystery, but the birthdate matches what it would be if her reported age in 1910 was accurate.) Her sponsors (godparents) are listed as John V. (or D.?) Murphy and Rose McGuirre (McGuine? - different person, different handwriting, and still I can't tell whether that's a rr or an n). I'm wondering just who these godparents may be - possibly John Murphy is Julia's brother-in-law, father of the Murphy nephews who would later (1910) live with them? Or not. Murphy is an extremely common name, after all. And Rose McGuirre makes me wonder whether the McGuirre men listed as boarded in 1900 were really just boarders. Could they have been relatives or friends who ended up boarding with the family? Did the Mulvaneys just become close enough with the families of their boarders to ask one to be godmother to Auntie Mae? Does anyone know who John Murphy and Rose McGuirre were?