In his "night before the end" scene, Brady has a breakdown becoming a sobbing blob and his wife tries to confort him. What struck me as particular is that at one point he addresses her as "Mother", and she replies "my baby". So this man had massive Oedipal issues and saw his wife as a mom proxy, the ever understanding Mrs. Brady acknowledging it and treating him as a small child?
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I think you are right, but the Mrs Brady character lacks any depth. However I feel that this scene is not really relevant for the movie, and neither relevant for the nature of prosecutor Brady. What is relevant - and quite telling - is Brady's breakdown in the courtroom when Drummond assaults him with questions about potholes in the Genesis script like the one about Mrs Cain. After all, the Land of Nod was not supposed to be populated with humans when Cain settled there. And that's not only a weak point in Genesis, but a weak point in the movie as well. An intelligent man like Brady would have had his theological answers ready. Brady fails, he looks bewildered and frustrated.
I find that hard to believe (even if this happened for real in 1925 in the Monkey Trial). I mean, most hardcore Christians today can 'explain' the length of the days of Creation and the controverse over Cain's wife away without a stutter. If you really set yourself to it, you can rationalize Snow White & The Seven Dwarfs or Terry Pratchett's Discworld universe (exactly what Pratchett himself did!) But all Brady does is riposting with 'it's what God said', and 'it's true because it's in the Bible!'. His conviction nucleus is that 'God is', which, for him, explains everything, including the unexplained. Just two words; 'God Is'. Wow.
Drummond won in the end because Brady's fundamentalist faith crumbled. Just like that?
But a court case like this would never stand a chance in our times anyway, the discussions between prosecutor and lawyer would literally be endless.