My g g grandparents are Samuel Lightfritz and Catharine (Kate) Wilgus. I believe your James Lightfritz and Caroline Wilgus are thier brother and sister.
What I am actually lookng for at present is something to prove that Samuel is John Lightfritz son. I can't use census records (John died before children's names were given), I couldn't find an obituary for John, Samuel's didn't list his father and I haven't been able to find an obituary for Samuel's siblings that list Samuel as a brother and John as father. A family bible record would work also. Do you have any such records?