I know it's N of 1 but I did grad school with a wife and kid both at home, all of us supported on my typical student stipend. Then lived in one of the most expensive locales in the country as a postdoc, again, wife was at home with the kid(s). Started making $45k, 2.5 years later was at $55k (you do know that postdocs can ask for raises, right?). Now in a tenure-track faculty position, have federal funding, and making $125k/year. It's not impossible to make it work, and I'd do it all again.

You're one of the fortunate ones - and undoubtedly you worked extremely hard to get into that position. But many people also work hard but do not wind up with the same reward at the end of the road.