1: I strongly believe the Alice ALLEN (born Alice CANTRILL) is my 4x Great Grandmother. She was born in 1759 as you have calculated.2: George ALLEN was her husband, and he was my 4x Great Grandfather - he was possibly born about 1756. There is a George ALLEN who died in March 1824 - this may be he, but I am still researching both these dates. If it was 1824, then that would likely explain why he was not named on the 1794 gravestone.3: Grace ALLEN, born as Grace PARKER in 1717 as the memorial states, was my 5x Great Grandmother. Her husband's name was Robert, and they were married 1n 1740. So the above George, their son was born when Grace was about 39 years old.