I cked the new entries on ancestry.com. Am I right when I figured out that there were 3 Montgomery sisters? One married to Irish George and the other two were married to Robert?
I just didn't think about this long enough. Robert and Catherine had a son named Robert born in 1855. This 1855 Robert married Mary E. Montgomery who was born in 1838. She was 17 years older than Robert!! This was on the gravestone picture. Catherine was born in 1830, Sarah in 1836 so I am thinking that Mary (1838) was their little sister. Very coincidental with the last name and the dates. That would be like my son marrying my little sister which would be very strange.