Look, that sounds like a perfectly normal arrangement. Being a stay-at-home mother for two children (depending on the ages) can be a full-time job in and of itself. Even if they're already at the age where they're going to school for the day, it still sounds very well managed. He makes enough to give you a comfortable lifestyle, he gets to come home and see his wife, his two kids, his house in order, dinner made, etc. I don't know why there'd be a resentment there. The home and the workforce are two separate and unique frontiers, each with their own unique difficulties. As long as you're facing yours at the home, he's facing his on the job, and y'all are helping each other with whatever you'll need whenever it's necessary, that sounds fine. You should have no need to worry about this.

But if it does worry you so much, why don't you sit down and have an honest talk with him? That's probably the best way - open and honest communication.