My husband has a Peter Mellinger in his family - Peter married a sister of his great grandmother, Rachel Ann Wood.
Peter Mellinger was possibly born in 1831, location unknown.Peter married Mary Jane Wood before 1858, possibly in Howard Co., OH.Mary Jane Wood was born May 1839, possibly in Ohio. Mary's parents were James Wood and Mary Baumgartner/Baumgardner.
Peter and Mary had the following children: James, Martha, Mary E. and William.James was born in Nov 1858.
I don't know whether we can make a connection or not.If any of this information sounds familiar, I would like to hear from you.