Caroline Amelia Kerr (Rollins) - Proof of Caroline's marriage to Nathaniel John Kerr; Mary Jane Kerr Howe's death certificate shows different parents

Please share sources for Caroline's marriage to Nathaniel John Kerr and birth of daughter, Mary Jane. So far, I have seen the stories that you shared here and no other documents. I found an Mary Jane Howe in Anderson County, Texas in 1880 census with children's names and ages that are consistent with earlier census records. I also found a death certificate for Mary Jane Long, died June 1918 in Baylor county, Texas. Her parents are listed as Robert Kerr and Caroline Lightner. Do I have the wrong person? Thanks. Susan Posten Ellerbee, sellerbee@cox.net. FYI: I am doing the Kerr family tree for a family friend. Thanks.