The very man, Alan.
Both John McIntire and Jeanette Nolan would have met Orson Welles when they were in their 20's, in the year 1935, on "The March of Time" radio program (a parody of which, "News on the March," is featured in CITIZEN KANE). McIntire and Nolan soon married. For several years, Welles and Nolan did voices for contemporary historical characters on the show, and McIntire was a featured announcer. Both McIntire and Nolan had important parts in Welles' Salt Lake City production of Macbeth, and Nolan carried over into her debut role Lady Macbeth in his movie of the play in 1948. About the same time McIntire began a long career as a character actor in Movies and Television, often teamed with his wife.
What truth there is in the discussion of Tim McIntire, born in 1944, is hard to say. John McIntire as well as Jeanette Nolan, like Welles, began in Radio, where the style of time required them to reduce their vocal pitch by as much as a full octave. McIntire and Nolan might very well have passed that technique onto their son without any genetic help from Orson Welles. And, after all, they were married for 56 years.