I'm a big fan of not mixing family and money--things just get tricky, especially if your mom wants to do things her way. Your way will become more and more important down the road, as you start having to really discipline, potty train etc. I was a stay at home mom for 18 months and was terrified of the thought of nannies, daycare, really anyone tending to my daughter except me! I decided at 18 months that my girl needed more kids to play with and enrolled her in preschool. It has been wonderful!! In fact, she now (she's 2), at her insistence, goes every day from 8-2. I'm a little sad that she likes it at school better than being home with me, but she really loves it there, so I'm going to find a job and add to the family income while she's at school. If you find the right school (and you'll know as soon as you walk in which one is that magic fit for you), she can really benefit from the other kids, a structured enviornment etc and your family can just be family. Another benefit to preschool is it totally wears them out--your daughter will sleep better than she ever did before! That's my opinion. I'm still a bit iffy about nannies though--daycares and preschools are regulated--nannies are all alone... You'll make the right decision whatever you choose--good luck!