There's a little uncertainty on the family of Thomas/Michael Shannon.
The initial outline I got from Mary Flood names him Thomas J. Michael
with wife Frances and sons William and Leroy, apparently from
a 1920 census entry, but I couldn't find this family in the 1920 census.
I also can't find his parents (William and Catherine) in the 1900 census,
which would also be a help.
I found a widowed Frances in 1930 with sons William and Leroy, and
found an obituary for a matching Leroy Shannon, which
names his mother Frances Burton and his father Michael Shannon, a
brother William and a deceased brother John. I think John must have
died as a child since John wasn't in Mary Flood's records and isn't in the 1930
census.