For our first nanny I used a nanny service.  It was expensive but they did all the grunt work-prescreening, background check, pulling driving records, checking prelim references. I could then do extensive 4-part interviews and do my own follow up reference checks. The fee also guaranteed emergency coverage, access to weekend/evening sitters if desired etc. They helped me develop a good contract, job description, house rules, etc too. For our first nanny who would be watching a non verbal infant it gave me peace of mind.
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My recent nanny I found using sittercity.com. Inexpensive but the bulk of the grunt work is on you and you have to weed thru a LOT of undesirables. They claim to do background checks but I did all my own checks.
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If you are not experienced in hiring an employee I highly recommend you do your homework. There are great books out there to help you develop good interview questions, walk your thru doing background checks, the best questions to ask a reference. Make sure you develop a job description that clearly outlines your expectations. Since your son has special needs you would want it to include things that are specific to his needs.
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If you spend some time going thru old nanny posts here you will see what parents expect runs the gamut of "100% childcare and that's all" to "I expect our nanny to also cook, clean, do all the laundry, grocery shop, pick up the dry cleaning and run errands" There are nannies who do it all and others who just do childcare. Â You can weed out a lot of candidates by being upfront with what you want, especially since it sounds like you are going to want someone with special needs experience.Â
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Good luck, Â It's a lot of work but worth it when you find the right one!