Huh, it's not often you see such a comedic spin to the yandere trope, and MC as well as his dad ... yeah, that's the reality for most married households today, and even if you want to get a divorce, the wife will surely get half his assets, if not more, and will be most likely to get custody rights, even if MC says he wants to stay with the dad, and the dad will have to pay child support on top of it (at least not for long once MC turns 18, unless these laws differ in Japan).
It's just far better to live the single life alone these days than to be in a family who doesn't respect and appreciate your hard work that's providing for the household.