Here is rough summary of what I know about my family’s ancestry.
Unfortunately, I don’t have very much details and I barely have any
specific dates because my family members didn’t have access to the
firm timeline of my family history.
American side
As far back as I can go, my US grandfather’s father’s ancestors lived
in England, and moved into the United States before the American
Revolution, possibly before the Declaration of Independence. This is
likely to have happened during the mid 18t century. After moving
into the US, they stayed there for several generations, moving from
Pennsylvania to eastern Ohio, eventually moving up to north western
Ohio later on.
On my grandmother’s Mother’s side, my great grand mother’s parents
moved in form Ireland and the Netherlands. This is possibly due to the
revolution during the time and the poor standard of life. On the other
hand, my grand mother’s father’s parents moved into the US from
Czechoslovakia (current Slovakian side) around the late 19th century,
also probably due to the poor life standards in central Europe of the
time.

(above; the shaded pink area shown on Belgium is the Flemish Dutch speaking area of the northern half of Belgium. This region is called Flanders. The country south of Poland, east of the Czech republic, south west of Ukraine, north of Hungary, north east of Austria, is a nation called Slovakia, where a part of my ancestry originate from.)
In addition, my Grandfather’s Mother’s Mother’s Father moved from
Flanders (region in Belgium) to Pennsylvania as early as the 1700s.
After all these ancestors settled in the US, my Grand mother, Barbara
Brown, happened to be born in Ohio in the 1920s and grew up there.
Barbara met my grandfather, Leland Brown in a college somewhere around
the great lakes region. Then the two moved to Michigan (suburb of Detroit) due to Leland’s job as a doctor.In the 50s~ 60s my father and my two aunts were born in Martin, Kentucky, due to some doctor related business. My uncle, Tim Brown was born in Idaho due to my grandfather’s navy related business.
Japanese Side
As far as my mother knows, she does not know any other major migration from somewhere else besides Northern Tochigi prefecture, where she was raised. As far back as many generations we can go back, she says she only knows that they have been living in Tochigi prefecture.
Above; Tokyo is in yellow, and Tochigi is in violet.
My mother moved to the Tokyo metropolis due to her marriage with my father, in 1979. My father moved into Japan in the mid 70s during his colleague times to learn Japanese. He came for a visit, but unexpectedly he ended up living here for over 30 years. My mothers sisters’ daughter,(my cousin) moved to the Kansai Metropolis (Kinki area) probably for studying in a college. Up to recent years, after living in Gifu, she moved up to Yokohama.