For Name's Sake Multi-Cache

This is a cemetery cache, but the final location is outside of the cemetery. City workers who maintain it tell me this cemetery encompasses more than 50 acres. It is a full time job keeping this place mowed, trimmed and in good repair. The coordinates will take you to a tall family headstone. They are not relatives of mine, but when you see it, you might appreciate why I chose this location. All of the headstones you are seeking are within 10 feet of this spot, and all share the same last name. Don't worry, there are only a few to choose from. This cache should take only a few minutes to complete. The cemetery is open during daylight hours only. Dogs are not permitted in the cemetery. This cache has been placed with the approval of Thayer mayor Ken Cotham.

The final coordinates are: N 36.3A.BCD, W 091.32.EFG

To find the final location, find the following information:

On a headstone about 10 feet North of Mary and Ralph, how many days did the baby live? = A 

Subtract 4 from the last digit of the year Mary died to get B 

Subtract the year Ralph died from the year Julia died. Then add 2 = CD

In what month was Francis born? = E 

Last two digits of the year Mary and Ralph were born = FG

Checksum for final N = 24

Checksum for final W =33