I was in somewhat of a similar situation recently. I provide before and after school care for children who attend my daughter's school (for convenience), and when I first started out I accepted my friend's daughter. She is a paramedic and only required random days of care, and random days through the summer. Well, now that i'm more established I can not accomodate such a random schedule as my business suffers for it. When she supplied her summer schedule to me, there were several days that wouldn't work number wise...and I also let her know that as of September I would only be able to provide after school care for her on Tuesdays and Thursdays. She was upset and "wanted to talk" (hate that!), and felt like I was trying to bump her out. I DO like Mom, but honestly I didn't care. I let her know that as I was starting out I had more flexibility for a sporatic schedule but now that I'm more established I need children to work around each other and so my availability has changed. She said she understood, but if it doesn't work out that they'll find alernate care...thats fine!!!