Finding a great caregiver for your family isn’t just about identifying someone who’s free this Thursday night. It’s about ensuring the right fit for your family, someone who makes your child’s safety and wellness top priority. Once you’ve discovered some high-quality candidates (by posting a job at Sittercity, naturally), the interview is arguably the most important step.  Seriously, is there any substitute for the give-and-take of a conversation as well as the gut feeling you…