Since they both consider me a confidant, I find myself walking a tightrope of objectivity while still trying to remain supportive.
That must be difficult and I don't think it's right for anyone to put their child in that situation. I can recall knowing way too much of my parents marriage woes as a child. Should my wife and I ever have a dispute, I hope to be able to shield it from my daughter or at the very least, never include her in it.
Price of admission to adulthood. The older you get, the more the parents become the children and the children become the parents. Never arguing in front of your child is a good policy and one that resonates for me as a new parent. Again - tightrope. Don't want to argue in front of the kid but don't want to suppress an issue until it blows up to be worse due to festering.