Surely it is evident that Barrie's father played a significant role in J.M.B.'s life. Were it not for his beliefs, self-sacrifice and determination, his son might not have received the excellent schooling and university education that he did.
As J. A. Hammerton wrote of David Barrie, “It is astonishing to think how much David Barrie achieved in the way of self-culture during those years when his day must have been so fully occupied with the dire task of earning the daily bread.” “He began life at the loom, but had an appetite for learning, more common in his time than in ours, and, by dint of self-education, he had acquired considerable literary culture by the time that James was born.” And further: His “respect for book-lore gave him a veneration for all men of intellectual gifts. Education had become a fetish with him. No father was ever more resolved that his sons should have the best schooling, at no matter what sacrifice to himself.”
Margaret Ogilvy may have “entered into his (James's) boyish enthusiasms” and “encouraged him in his earliest literary adventures”, but I hope no-one is suggesting that David Barrie did not also exert some literary influence. While it is true that Barrie did not write a companion volume to 'Margaret Ogilvy', those who knew his father seem to have believed his character might have inspired one.
Remember, also, that Barrie acknowledged his father's input when writing his '”Educational Nurseries” - How a Child Drove me into the Wilderness': “Here am I, at the age of six years, so full of learning that yesterday I had a grey hair.” “There is not, I suppose, anything I don't know, and if there is, father will be bringing it home on Saturday.”
And Barrie wrote this tribute while his father was alive to read it: “One who proved a most loving as he was always a well-loved husband, a man I am proud to be able to call my father.”