Hello Donna, I haven't visited genealogy.com for some time and came across your message. Your grandmother, Catherine McGivern, born 1849 is the third child of Michael and Catherine (Ford)McGivern. I can share pictures from a tin type of Michael and Catherine that I took years ago from a great Aunt in Marshfield.
I didn't have Michael's father's birth. Do you have their names by any chance. I know they were from County Down Ireland.