Frederick Michael (b 1790) was married to Elizabeth ?????
Their son John Michael was married twice - 1st to Elizabeth Wiliams in 1780 and 2nd to Elizabeth Shaffer in 1803.
From John Michael's marriage to Elizabeth Shaffer,they had a son, Frederick (b1804) who married Elizabeth Hurshour/Hershour.
This marriage( Frederick and Hershour) produced Sarah Michael (b 1832) who married Frederick Michael (b 1827).This Frederick Michael (Sarah's husband)was the son of George Michael (b 1770) and Elizabeth Heine.George Michael (Frederick's father) was the son of Frederick Michael (b 1720).Sarah married her cousin.
This is very confusing with so many Fredericks. Hope this helps. Lorene (Michael) Anderson Reneiand@aol.com