Child care in SF, if you really need the full time kind that allows you to work full time (but not overtime) is going to run you about $2,500 a month. Two kids, you are looking at like $60k a year in childcare. If you have a family on an employer healthcare plan, you will likely have to cover some of it from your paycheck, $6k a year wouldn't be too unusual. Keep in mind, you'll still be the person who absolutely has to stop at 5:30, because you can't leave your kid at daycare.

Tech companies may try to solve this by avoiding employees with families and kids. "I want to stress the importance of being young and technical.. I don't know...Young people just have simpler lives. We may not own a car. We may not have family."