Migrations can work in a variety of ways. There was a family where the parents and the children moved from Illinois to California in the 1930s during the Great Depression. I had difficulty finding one of the daughters after I had located the death information on the parents and most of their children in California. The west coast of the United States is where I kept looking for them.
When I broadened my searches, I discovered that one daughter had moved back to the exact location in Illinois where the parents were from and where they were living before they moved to California in the 1930s. At this point, I’m not certain exactly why she moved back, but it’s always something to consider. Sometimes children who are “pretty much grown” and move somewhere with their parents end up moving “back home” even if their parents do not.