On Rootsweb World Connect Project, firstname.lastname@example.org has the following as siblings of Robert:John Marshall Allen, b. 17 Oct 1818; James Madison Allen, b. aft. 1804; Benjamin F. Allen, b. aft 1810; William H. Allen, b. aft. 1810; Merean, or Miriam Allen, b. aft 1810; and Louise, b. aft. 1810.I have not verified any of these, but am only reporting to you what I found on Rootsweb.Naomi Emmich, also on Rootsweb lists eight children for Robert B., b. 25 Aug 1826, md. Elizabeth Jane Hanks, b. 6 Apr 1827.Again, I have not verified.If you cannot find the entries by searching on William Allen, b. 1773, father Richard, please let me know.