When I started, it was in April 2011, and I incresed my fees that Dec starting the new year (2012)with a new rate for all my families. I was also charging too low and upped it $5 per day. All of my families stayed and nobody took any issue with it.
I have kept those families on their rate but any new families I have taken on pay $3 more per day. I will probably increase again for 2014. I think this is fair.