Disclaimer: I own nothing but the plot.
Charlie finally got promoted at work. He was getting paid the amount of both their paychecks combined, plus a few hundred more. Renee was able to cut back on her own hours without a drastic cut in their budget.
They could even indulge on a few things, like eating out, getting newer and nicer clothes, and some newer furniture.
They could put more money aside for a car, a new apartment, maybe even a house or a baby in the future. They felt like they could finally breathe.