One of the most common sources of married couples getting in fights is money. People who have more money or are the only ones working in the family often may still expect both partners to contribute to their common budget equally, even if the less-earning partner takes on more of the other responsibilities.
Another 3 months passed and the wife lost her grandma, who was her only family and pretty much raised her. She left her granddaughter a big inheritance, which allowed the family to buy a house instantly, two cars, and there was more left to invest to have extra money for retirement. The OP’s wife started going to work again after she gave birth to their daughter, but when her grandmother died, she left due to physical and metal health issuesThe OP was resentful that his wife is not working because he would have liked to be a stay-at-home-dad as well instead of working 36 hours a week.