Hi. Did they have children by the names of John,George,and Elizabeth.
I have a gravestone for lanchester with Thomas who died age 74 and a Mary who died aged 68.It is a very weathered stone with lots of flaking. Here is the inscription
but bear in mind that there are lots of gaps. It may help if it is yours.
Family burial of Thomas Shield of Quaking House.
Elizabeth his daughter died Jan/30/1825 age 2 and a half years.
Elizabeth his daughter died M??/5/18?? ages 5 and a half years
John his son died Feb/2/185?
Mary Shield aged 68 years
Thomas Shield Dec/??/1868 age 74 years
Also Thomas son of the

names Feb/3/1877
Mary Shield died Feb/15/1869
Mary Shield died 1869.
If it is yours you may be able to fill in places where it is unreadable.
Adam