I am trying to find descendants of Peter Van Voltenburg (changed to Van in Jones Co IA in March 1854) and his wife Lydia Holt. Their children were William b. 1855, Robert b. 1858, Ira b. 1861/1864, Eva/Lizzie b. 1864, Sarah/Sadie b. 1867, Laura b. 12/28/1867/68 and Henry b. 1873.