In Loving Memory Mystery Cache

The posted coordinates are going to bring you to the resting place of people near and dear to me (Madam Hill) My paternal Grandpartens. You will find the information that you will need at the poosted coordinates.

N43 17.ABC

W085 05.XYZ

A = Arthur's birthday     6/2A/1918

B = Mary's died on     B/12/1997

C = Edward's birth year     191C

A + B + C = 12

X = Arthur's birthDAY minus the DAY he passed minus 4

Y = Mary's birth MONTH times 2 minus 1

Z = Edwards YEAR he passed minus YEAR born divided by 16

X + Y + Z = 10