A memorial to 2 brothers and 2 sisters. Can you spot an error in the text?

St Mary the Virgin, Woodford, Northamptonshire
(Click on an image for a larger version)
Much of the fabric of the church is 13th to 15th century. It was restored in 1878 when the tower was rebuilt and enlarged and a new vestry and organ chamber added.
A memorial to 2 brothers and 2 sisters.
Can you spot an error in the text?
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Where is the best place to see pictures of other unusual graves?

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