You might try looking at the Church of Latter Day Saints Microfilm # 0193173 for Siebeldingen in Deutschland.
One of my ancestors had a brother by the name of Johann Friederich who was born on February 8, 1721 and another named Johann Adam who was born on February 1, 1729.
Their parents were Andreas Fluck and Anna Catharina Leiht who married on June 2,1716.
I am trying to find a lead on Andreas's parents Rudolph Fluck and Anna Marie ?. The only Rudolph Fluck's I have been able to find are in Dinhard Switzerland but I have been unable to establish a connection.