Sorry to be so harsh, but it really sounds like you are starting to hold on too tight. I understand hating to have them away from you and I understand that it isn't fair, but as the adult you need to help the girls adjust and allow them to be kids and do what they want to do, not what you want to do (as said above).
Exactly. Well put.
Gardener
"My soul, be satisfied with flowers, With fruit, with weeds even; but gather them In the one garden you may call your own." Cyrano deBergerac