Sorry this hasn't reached you earlier but after putting the family down for several years I have recently picked it up again. As the records are in a bit of a mess, I'd be happy to recheck anything for you.
John J. McGinn (1868-1927) and Alice A. Howard (1870-1944) were my maternal great-grandparents (thus Thomas Joseph Maginn/McGinn was my GG-Gradfather).
John and Alice had at least 8 children: Thomas Joseph McGinn (1890-1952) Annie Cecelia McGinn (1892-1952) Mary Loretta McGinn (b. 1894, don't have dod handy) John Francis McGinn (1895-1971) Joseph Cornelius McGinn (1897-1954) - my grandfather Howard Bernard McGinn (1899-1968) Alice McGinn (1901-1935) Francis J. McGinn (1904-1963)
John J. McGinn had at least 7 siblings as well, about whom I have some info.
I have located numerous burial plots in Worcester (St. John's Cemetery) as well as a couple in the Boston area (where Thomas Joseph Maginn/McGinn and his 2nd wife Annie Cecelia Houghton are buried. I haven't yet located where Thomas' 1st wife (and John's mother) is buried but I believe it is in the Boston area as that is where she died.
Please let me know if I can help you fill in some blanks.