As promised, I contacted my brother regarding any more details of my mother's father, Frank Rapaport. Here's the extent of what we know.
Frank emmigrated from Braila, Romania. At some point he married my grandmother, Florence Gladstone of Georgetown, SC. In 1918, the couple had my mother, Lois Rapaport. Two years later, in 1920, Frank left for New York. Off and on, Frank apparently tried to get in contact with my mother by mail, the last time being in 1935, at which time he was still in New York.
That's all the personal details I have at this time. In doing some more research on Romania and the Rapaport name, I also found a couple of items I hope will help you.. In 1900, due to "severe discrimation in Romania and an almost total denial of political rights," a mass emigration of Jews began. From then up to World War I, almost 70,000 Jews left the country. This seems to jive with our details and time frame; how about yours?
Additionally, I found a posting on jewishgen.org which reads as follows: "Lost branch of the Rappaport (Rapaport, Rappoport, Rapoport) family search page. To complete our family tree, we are searching for a lost branch of the Rappaport family, which moved to the US at the beginning of the 20th century. Benj. Benjamin, Minnie, Israel, Mollie, Helen or Hellen, Max and Bernard." This post states it was submitted by Noam Rothmann e-mail address firstname.lastname@example.org
and gives an internet page -- www21.brinkster.com/hanoam/family/index/htm
When I saw the name Bernard, I wondered if he might possibly be the namesake of your half-brother, Bernard.
Maybe a coincidence, maybe not. In any case, I sincerely hope some of this helps you. Please let me know what you find out. Thanks. -- Henry L.