If you mean Jean M. Barrie of the steamer-trunk mystery, it's not clear if she is. There was a woman by that name who identified herself as a "close relative of" James Barrie, but he had no children,...
Margaret Ogilvy and David Barrie.
J. M. Barrie died on June 19, 1937 at the age of 77.
J. M. Barrie was born on May 9, 1860.
Sir James Barrie was born on May 9, 1860