I found the death registration for son Alexander on Scotland's People which gave his parent's names. The informant was George Sangster listed as a "half nephew" of Hillhead of Meadowbank.

Ian Stead found the death details of a new daughter Jane. He wrote:

"I suspect that you can add another child - Jane McTavish (maiden name Mutch, mother's name Riddall, died at St Machar 7 Feb 1899 age 89 (90 on tombstone). According to censuses she was born at Belhelvie, about 1810.

Jane Mutch married John Sangster 16/5/1829 Belhelvie, and married Angus McTavish 29/7/1858 also Belhelvie"

Ian later contacted the site to suggest that two family lines previously shown [G1] George + Ann Riddel and [G3] George + Mary Mackie were the same George. He wrote:

"I think that I have made an interesting link, suggesting that G1 and G3 were the same person. Both are at Belhelvie. G3 married Mary Mackie in 1792 and had a family there from 1793 to 1806. G1 married Ann Riddell in 1808 and had a family there from about 1810 to 1816 (perhaps later). There is no overlap in the children's names. When Alexander (A22) eldest son of the first marriage died in 1867 you noted that the informant was his 'half nephew' George Sangster. Jane Mutch, of the second marriage, married John Sangster in 1829 and their eldest son was George Sangster (1829 - 1915) who would have been the half-nephew of Alexander of the first marriage."

After further correspondence and record research I agreed with Ian's conclusion that both of these family lines were indeed one, so I have now consolidated them under G1. The only missing brick is confirmation of Mary Mackie's death between 1806 and 1808.