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William and Mary Brook were my gt.gt.grandparents through Eliza Brook their daughter.  Through census information etc. I have found 6 children - i.e.James, Harriet, Hannah, Jane, Eliza and William all born at 2 or 3 year intervals from 1792 to 1809 except William.  This last child was born in 1820 Alverthorpe, and Mary would have been 49 years old - not impossible but I wonder if he was really a grandchild.  In your message you mention an obituary and 9 children.  Does it mention any of them by name and particularly William.  If he is her son then it's possible the missing children were born in the gap between 1809 and 1820.  I haven't been able to find William and Mary's marriage but from an age point of view I would guess that James was their first born.
I did find that Jane who married John Kirk had 10 children.  James and William also had children.
I would be grateful if you could let me have the details from the obituary and whether you have found their marriage.
Margaret
P.S. Fiona is a distant cousin and we are in touch.