I can help on the siblings. The children of Joseph and barbara were John D, b. 1799 d.1878 married Nancy Maret 1 son, 3 daughters, Rev. Benjamin Blanton b. 1800 d.1887 married 3 times Sarah Wilson 1 son, Letticia Glenn 4 daughters and Sophia Jane Tyler, 4 girls 1 son, Lewis b. 1804 d 1866 married Matilda Swan,Jacob b 1805 d 1881 married Matilda Martha ? 6 children ,Dr. Joseph Hubbard b1818 d1889, William, Polly,who married Joel Ledbetter and Betty, never married. I am Benjamin's gg granddaughter with his third wife. As for his parents - still working on that but sure it will tie into Elder John's bunch. They were all in the Elbert Co Ga area at the same time. If this proves true then Joseph's father would be Daniel Parker b 1749-50 died 1818 Dickson Co. TN married Sarah Mackintosh. Also in Dickson co is Daniel's son, Moses 1778-1855 who has a son Joseph A. b, 1824. Also there is a website that claims both headstones (Moses' & Joseph's)have Daniel's name. These 2 facts are leading me to believe that Joseph and Moses are brothers and Daniel and Sarah the parents. Perhaps this helps. Let me know if you need more. Part of this information came from a booklet by Lois White Patton titled The Lewis Parker Family, 1958. Becky Holland Overcast