I have 3 dds, aged nearly 15, 13 and 9. We've used babysitters up to about a year ago when we thought our oldest was sensible enough to babysit and she was happy doing so.
It sort of worked for a while but youngest dd would sometimes get very upset or anxious and we would have tearful phone calls from her - I really miss you, when you are coming home etc....
We had a chat with her about it and she says her older sisters get cross with her. This is exaggerated by the sounds of it, they might get a bit irritated by her insistence on calling us. Dd3 says she feels more comfortable with an adult babysitter so in the last few weeks that is what we have done.
But it seems a bit OTT to pay £25 to someone to sit there all evening. Older two don't particularly like having someone else there and can't understand why dd3 is being like this.
I just don't know, shall I put my foot down and say to dd this is how it's going to be and you'll stay with your sisters?