I'm trying to find an open door for you to go through, and I see several. Let me make sure I have this straight. Elizabeth Gross married John. G. South, probably in Pennsylvania, moved to Ohio (where?) and on to Michigan (where?). Her last known child was born in 1852 and she is NOT in the 1860 census for Michigan. Is her husband listed? Where do her kids show up later on? Have you run them through FamilySearch?