If they aren't blacklisted from legitimate company's then I doubt they are using one, I feel like they will be doing this through private advertising or word of mouth which makes it even more scary when you think of the amount of lunatic stans they have, at least with a company background checks would be getting done but then they would need to also pay the proper amount (which when it comes to their kids they don't want too) an also not be able to take the piss, a company would also maybe have set working hours for their nannies so like maybe they can't do more than say 40 hours per week and/or can't do more than 2 or 3 overnight stays per week, an if they go over hours or stays perhaps pay needs to be doubled, I really think they are doing this private because it seems like they really take advantage, didn't they have one nannie sleep in a tent while they had the RV? I doubt a company would allow that