BLGS2001 reports that Finlay and his son Patrick are "only mentioned in Douglas" and are not accepted by at least one genealogist "for want of corroboration", BLGS2001 is referring to Sir Robert Dugdale's 'Baronage of Scotland' where, in the entry for 'Macnab of that Ilk', he does refer to a charter where Patrick was "particularly named". However, as Douglas appears to have confused several generations, that reference may be spurious. Aftter Patrick, Douglas reports the Chiefs as follows: Finlay (d after 09.02.1502) father of Finlay (d by 1542) father of Finlay (a 1553) father of Finlay (d after 12.07.1606) father of John (m. dau of Campbell of Glenlyon) who, apart from the fact that he apparently survived the battle of Worcester in 1651 whereas Douglas reported that he died there, is the John shown below as father of Alexander, 13th Chief.
BP2003 mentions but skips over Finlay & Patrick. BLGS2001 includes them apparently because "there is no other infocmation to fill the gap". It is noted that neither Finlay nor Patrick are attributed chiefdom of the Clan inasmuch as it is Patrick's son who is generally identified as the 2nd Chief. However, that may just be because they were omitted from a list of the Chiefs (probably wrongly, given that there is a clear gap in the generations between the '1st' and the '2nd' Chief) at a time when their numbering became established.

Sir Allan Macnab, Bart, Prime Minister of Canada (b 19.02.1798, dspms 08.08.1862) had issue