Sorry you have had a run of dishonest families, but keep the faith and keep trying. Extensive pre-screening will save you a lot of time interviewing people who don't match your needs and I'm glad to see that you do that. Sounds like you are doing everything right. I'm wondering if maybe ou state the question as, what are your work hours? Instead of what hours would you be using at daycare. Then ask where they live and ask about their commute time so you can figure out their hours over the phone pre-interview.