Need Some Advice! : (

So I have cared for a family for the past 4 years 10 hours a day and I need to vent!! I love the girls to death they have really become part of my family!! The girls are 7 and 2. During the school year the 7 year old does not come to daycare but she usually comes in the summer! I am mad because ever since last fall I have been asking and being assured by mom that the older child would be comming this summer! I have asked her several times to make sure and kept being reassured that she would be! I guess I should have asked for money as an incentive and shouldn't of taken her word for it because again I asked to be sure this week and she informed me that the 2 year old will stay here but they are going to send the 7 year old to her best friends house whos mother also does daycare! WHAT?!?! I have turned down several families in this time so that I would have an alloted spot for the older child all summer!!!: O They are going to drive at least 20 miles out of their way each day each way to do this!! WHAT?? Are you serious just to have your daughter play with her best friend all summer! They informed me that they loved my daycare and it had nothing to do with me just thought that it would be fun for the two girls to spend the summer together!! They are seperating their children and are going to send them each to different daycares! I guess I am hurt I have done SO SO much for this family! I have discounted their daily price to help them afford having two kids in daycare, in which I usually do not do, the dad was laid off two different times this last year and I willingly gave them the time off unpaid until he would return to work, I let them all summer send their older daughter part time but they send the younger one full time they send the older child to grandparents one day each week all summer to save on money and I have let them go week by week and pick which day that they will be taking off with little or no notice! I could go on and on of how I feel that I have helped them and yet they turn around and pull this on me! I am extremely hurt, angry and feel taken advantage of and I am not sure what to do! I have written them a page letter but I am nervous to give it to them! It basically says how I do not feel respected and expresses how I feel about the situation in all that i have done and given them! I have loved and cared for these kids unconditionally for the past 4 years and none of that matters!! I feel like they have not thought of any of this on how it would affect me and all that I have done to help them!! I am stunned!!! : ( This has never happened to me and I guess I thought people had bigger hearts than that!! I guess I learned my lesson! Anyway I am scared to give it to them because I certainly don't want it to harm our relationship and I do not want for them to pull their other child out as well but I do feel that they have harmed our relationship and if I do not get this off my chest I will hurt and be frusterated for a long time and don't want that either!! What should I do, the letter is not mean at all, but I don't know how a parent would take it!! : I I just said that I do not want them to feel obligated to send her back to my daycare due to this letter because I certainly do not want the interfere with what they have told and set up with their older daughter she doesn't deserve that but I did ask that they look at the big picture next time and look at what I have done for them before they make decisions like this in the future and that they need to realize that I do not just do daycare because I love children but that it is also my job and that my family depends on the income I bring in from it just as their family depends on the income their jobs bring in and that I thought about that when Dad got laid off and that should matter when making these decisions! I don't know sorry I will quit whining.... I would just like to know what you all think I should do!! I have very deep relationships with each of the families I care for, I am basically these kids second mom and I think all being a big happy family is a path to success, well at least I thought I matter and was important in each of these families lives, guess not!! : (