When I just started nanny search many years ago, I asked a person who ran nanny agency how he made sure references were not fake. Here are a few tips I liked: make sure you ask both nanny and employer independently for details (when nanny started, how many kids, all responsibilities, trips to zoos/schools, etc.) -- those need to match. Also ask the nanny and the reference for examples of X (e.g., give me a story when a child misbehaved and what you did). If 3-5 examples are exactly the same from nanny and reference --red flag

. If reference having trouble coming up with stories you consider normal or all the stories sound unbelievable like person making it up as she/he goes -- again red flag.