Julie, I just came across this board and haven't really explored it yet, but I am related to the Loesch family. I am a Moravian by birth and wanted you to know that the Moravians kept very good records. If you went to "Old Salem" in Winston-Salem, I am sure you could find out much more about him.
I have some information in my files on what may be his father. I'll try to find out more if I can about the son. I copied the following from my notes:
Note from Old Stone Cemetery (Nazareth, Pa. a Moravian Cemetery) records: "His parents were George and Anna Loesch, of Gnadenthal. When Christianspring was begun in 1749, he went there as warden of the Brethren's House; 1753 appointed warden of the colony of unmarried brethren, who went to North Carolina, accompanied by Bishop Nathaniel Seidel and Gottlob Königsdörfer. In 1757 married Anna Blum in Bethlehem. He had five children. 1758 went again to North Carolina, and was made Justice of the Peace of Rowan County. The affiars in Bethabara occasioned much labor and trouble. Remained seven years in Bethabara. In 1771 removed to Nazareth as Superintendent of the property of the "Administration" and also Justice of the Peace. On his way to Hope, N.J., he fell from his horse and died in a house 11 miles from Nazareth."
That is info on the man who I think may be your Jacob's father.
I should look around this board some more before replying, but I had recently looked at those cemetery records and recalled this one.
Dave (A. David Thaeler)