Article continues below advertisementNicky Hilton is constantly swapping parenting advice with her sister, Paris Hilton. "We're always sharing little tips or funny stories about the kids. I am always trying to encourage her to keep the kids on a schedule because I feel that children thrive on a schedule, but I don't think Paris is as strict as me," the fashion designer, 42, exclusively tells OK! while talking about her newest collaboration with luxury children's clothing brand La Coqueta.