On the matter of cause, after almost 30 years of marriage I don’t like to look at conflicts it that way…that is, “whose fault is it?” It is worth determining cause not to put the onus on one spouse or the other to fix it but to identify what could make the issue better and what would make it worse. You’re on the same team, after all. Where one is weak, the other helps to compensate and vice versa.
You have the valid concern that you and your wife have some communication habits that could be having a negative impact on the children. More to the point, I don’t know anybody who habitually complains who feels good about it. In other words, you could say to your wife, “I realize that you have to be able to come to me with complaints, but I feel our way of handling this is not working in terms of what the children are experiencing. Do you think we could find a way we could tell each other what is bothering us, what is and isn’t working and so on that both lets us both feel we’re being listened to but gives the children and even the two of us more of a feeling of harmony?”
Yes, I think reading the Gottman books before you talk to her about this could give you lots of examples of how different ways of voicing your concerns and listening to hers will predictably have different chances of reaching a consensus that both you and your wife feel happier about than your cuurent way of communicating.
My husband, for instance, let me know early on that he was not going to be a party to “gunny sacking.” That is his term for stacking up a list of grievances and dumping them all out at once. We also do not go for meeting a grievance with an equal and opposite counter-grievance, which is usually just defensivenes. Considering one area of grievance at a time and bring them up as they come has been our rule. It has worked quite well for us, because he wasn’t telling me “don’t complain.” He was telling me the way to complain that was fair and constructive and the way that was unfair and more likely to lead to defensiveness than joint problem-solving.