BP2003 volume 2, page 2766. See link for full details for this source. Hereinafter cited as.
Sir Bernard Burke, editor, Burke's Genealogical and Heraldic History of the Landed Gentry, 12th edition, (London, England: Harrison & Sons, 1914), page 148. Hereinafter cited as Burke's Landed Gentry, 12th ed.
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her father's wife was MacDougall-66 - Is there any reason think she wasn't MacDougall-66's daughter as well? The documentation I found was the same for the brothers as for Catherine.