Hi again,
From the familysearch links I mentioned above:
In Mass. births 1841-1915 (registry images available)
Mary - 1890
Ann Catherine 1902
Robert 1905
Alfred 1907
Arthur 1907
There is also a Thomas 1889 with parents Thomas F. and Mary E. in Natick. Father a shoemaker. He sounds like a good possibility too.
In Mass. births and christenings (no images)
John - 1898 (mother transcribed with last name of Tobni here)
Ann Catherine - 1902
Alfred -1907
Arthur - 1907
Thomas - 1889 (no mother's last name)
So - from what I can see, there are at least 7 McGee children. I gave the birth years, but the actual birthdates are in the records.
However, there is a tree on A---y that says there are 11 McGee children and Mary Tobin McGee's parents are Michael Tobin and Hannah Newberry.

I am not sure that they have the parents right (see the image of the marriage registration in my previous post), but the other children may be worth investigating. They have all 7 mentioned here PLUS Edward 1887, Frank 1892, Joseph 1894 and Helen 1911. The Mary on their tree is 1892 and has a different last name.
RK