A Slaughter family seems to be very connected to this Matthews family,
although I do not know how William is related to any of them, or
what became of Lucinda and William after about 1850.
Besides Lucinda's husband William, there was an Elizabeth Slaughter married
to Daniel
Matthews in Pulaski Co., Kentucky. Also, Slaughters (later spelled Slater)
were witnesses to for Hetta (Goodman) Matthews in 1856 in Cedar Co., Iowa,
saying they knew her back in Pulaski Co. KY where she was married.
According to a Slaughter descendent (not from this William, but from the others)
the Slaughter family also came through
Ross Co., Ohio in the 1810s and 1820s, then to Tippecanoe Co., Indiana
by 1829 and Cedar Co., Iowa in 1837. There are several Slater families
in the 1850 Cedar Co., Iowa census.
This migration pattern matches pretty well with that of some of the
Matthews family, in particular Lucinda's brother John Harvey.
The Hatton and Dillon families also seem to be pretty inter-connected
with the Matthews. Besides Gibson Dillon who married Sarah Matthews,
his sister Catherine married an Isaac Slaughter (or Slater) and they all lived
in Cedar Co. at the time of the 1850 census.
Harriet Hatton, b. 1819 in Kentucky, married a William Henry Dillon, who
was a brother of Gibson and Catherine. Harriet Hatton was a sister of
Elizabeth Hatton Matthews, wife of John Harvey Matthews. It was
Harriet who urged John Harvey to come west to Washington. Parts of all
these families went from Indiana to Iowa to Washington and Oregon.
One brother of Elizabeth and Harriet Hatton, Harvey Jonah Hatton, married
Perlina Matthews (a cousin of Lucinda) and settled around Muscatine
county, Iowa (adjacent to Cedar Co.). Another Hatton
brother, William Shannon Hatton, went to Oregon with John Harvey Matthews.
The Hattons' father, Jonah Hatton, had also accompanied them on the
way to Oregon, but died of cholera along the Oregon trail in Idaho.