I ask that the child comes to the interview as well. I'm not playing with the child though, but talking to them once in a while when the opportunity arises. I'm professional and businesslike during an interview with the parents so that they know we are striking a legal contract and that I am in control of the rules in my daycare and serious about my contracts.
However, I tell them all the fun things I do with the children and that I save my nurturing side for daycare hours. Relax and be yourself because stress and anxiety really show up during the interview. But you have to work and deal with these parents, so I watch them nonstop during the interview to see how they react to their child and I want families who match my parenting philosophies. Also remember our saying, we are interviewing the family as well as the family is interviewing us, it's 50/50.