I need help with finding my MIL's German family

Hello all,

I just cannot find anything on Martha Marianne Marwinsky, born July 8,1926 in Kaiserslautern ( The Registrar's Office of Kaiserslautern -No. 657/1926). For several years I was told her last name was Marvinski. I have since found her work permit that spells her name Martha Marianne Marwinsky. I do not know her parents names. When Martha was alive she told me her parents fell in love in Poland and ran away to Germany to be together. At some point, her father became dissatisied with the way Hitler was governing so he became outspoken and I believe was handing out pamplets against the Regime. He was arrested and put into a camp. Her mother died at some point but I do not have that detail. Both my MIL and her brother Herman were sent to seperate sex orphanges until the war was over. Her father survived and was able to find his children but only after he had remarried a new wife. My MIL worked for a French diplomate after the war. She married my FIL, who was in the US Army, at Bad Kreuznach on June 11, 1955. She migrated to the USA soon after on a ship. She was pregant at this time with my husband. Can anyone direct me on how I can find her parents names? I cannot move forward for that side of my husbands family tree without this information.

Thank you so much,

Carol Willman