My two cents: It's really hard for any kid to go watch their parents go through a divorce, but if the relationship between the parents is strenuous, everyone in the household will suffer. As long as you're open with the kids, let them ask questions about it and remember to include them (where proper), I think a divorce can be better in that case than carrying on miserable.
When I was young, there was a god with infinite power protecting me. Is there anyone else who felt that way? And was sure about it? but the first time I fell in love, I was thrown down - or maybe I broke free - and I bade farewell to God and became human. Now I don't have God's protection, and I walk on the ground without wings, but I don't regret this hardship. I want to live as a person. -Arina Tanemura