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I guess that it is very possible that Kenneth, Allan, and Donald are related:  they are buried close to each other in the same cemetery (McLaughlin Cemetery in Vankleek Hill, Ontario Canada).  Based upon the inscriptions on their headstones, their birthdays are "about" 1800, 1801 and 1802.  Are they brothers or cousins? Two of them each married a Mary McRae while the 3rd married a Catherine McRae.  Now, I guess that I have to figure out how do I proceed to sort this out.  Any suggestions?

I am trying to find the parents of my ggggrandfather Kenneth McCaskill.  He came to Canada sometime between 1800 and 1833 (when he married Mary McRae) in L'Orignal, Ontario.Up to now I have stumped, but, I just came across a potential answer.  The answer is that his parents are John Donald McCaskill and his mother is Catherine Chisholm.  However, when I look at Kenneth's children, I am a bit confuse, because if I follow my understanding of ancient Scottish naming customs, it doesn't quite make sense.
Kenneth's Children (oldest to youngest) are: Kenneth, Annie, Rebecca, Donald, Margaret, Alexander, Malcolm, Catharine, Mary.
His father-in-law was Malcolm McRae and his mother-in-law was  Rebecca Morrison.
I thought that the 1st born son would be named after the paternal grandfather; the next son after the maternal grandfather; the 3rd son after the father - then the similar concept applied for naming the female children after female relatives.  Is my understanding correct, and/or can any one advise me where to do further research?  Thank you.