It's even easier with a wife, tbh, if she works as well. If both are pulling 40-50k you're getting there even faster, like half the time. Living beyond your means and not saving is not being sensible as well. That means, yeah, you buy a smaller house than you can afford on paper because they're going to sell you one that takes 40% of your income and that's too damn much.
Kids do add expenses, but it kind of goes in phases -- they're cheap when they're small, get a bit more costly in the teen years. After the teen years, it's not your damn problem, lol. The most expensive thing in child rearing is diapers and baby formula, seriously... Anything you can do in that regard saves a ton of cash.
Anyway, if you're thinking about the money only here you're missing out. Kids are great.
Depends on the wife. Hopefully marrying someone that's better than you at handling money. Kids, just saying one should wait until they can afford the added expense.