It sounds, from the additional details, that you're going about this nasty business in the right way. It's a blessing that your mom is backing your decision. I'm guessing that the marriage was a bit of a disappointment to your folks in the beginning. Those of us that were raised in the 'truth' often marry because of some sense of obligation and guilt.
As my folks told me when I was going through this...chalk it up to experience. Cut your losses and enjoy the rest of your life.
About kids ( I have those too ) : please consider counseling. The damage done because of divorce leaves scars for a lifetime. It will affect how they see you, the ex and their future relationships. Don't talk negative about your husband in front of the kids. He will always be their Dad. Ask your parents to show the same respect for the feelings of the children. They're innocent bystanders. Don't allow them to become emotional pawns in this game called divorce.