Well if you want it house broken and good with kids, don't get a lab puppy and maybe don't get a lab unless you have tons of time to train it; they're nice dogs but if they're not well trained they tend to become overbearing and will bowl kids right over with their enthusiastic affections. Furthermore, they are obese-prone and have a lot of genetic illnesses since they are a fad breed right now, something that is effectively ruining them genetically.
Have you checked petfinder.com? I'm sure there are plenty of smaller, healthier dogs there who need a good home that would be already house broken and good with children. I think that there is a massive ASPCA in NYC, too, and they are very strict on behavior testing so you might be able to find a good, reliable dog there. Good luck.