I don't know anything about Susan Scudder Costin except that she died before 1880 probably in Buchanan County, Missouri. I have the burial records for Buchanan County but my books are all in a mess in the garage! I will try and locate them for you if you like.
I don't have any photos of the Costins. I do have a photo of Laura's brother, Robert's wife, Nancy Alice Bryant Costin and her siblings. Laura's sister, Margaret Costin married Nancy Alice's brother, John William Bryant. He is also in the photo that I have. I am related to the Bryants and not directly to the Costins.