Be clear, definite, and firm in your policy statements. Act quickly and assertively. Don't be afraid to confront or remind parents of policies when necessary. And don't wait until tomorrow to deal with an issue. Set aside some time to listen to parents' needs and to get their feedback on how the program is doing.
Some programs have formal parent-staff conferences or meetings.
Others do so more informally. The important thing is that parents feel like they have an opportunity to give input into the program and that they are listened to. Help parents to become friends with each other. Parents are always curious about the children who play with their child. Introduce parents to each other when you have the chance.