Thomas Robertson - Another error

Whilst I managed to resolve the previous - I seem to have another - Thomas Robertson is the son of James Robertson Barclay of Keavil but it is registered he is the father & son of James Robertson Barclay of Keavil

I know this part of the family is complicated as James Robertson Barclay of Keavil is both the father of Thomas and his sister Susan and grandfather of his brother-in-law (Sir James Moncrieff-Wellwood, 9th Bt.) .as Susan married Rev'd. Sir Henry 8th Bt.& their 2nd son is the 9th Bt.