I already have so much on my plate to deal with. Now this

Yesterday Yaya came to me in the morning and tells me that her aunt ( my sister) is coming to pick her up.She has it all organized. ( apparently over FB chat! I am an idiot for allowing my sisters access to my kids on FB)

Now this aunt lives 120 km away from me, have not visited my home not even once since I came to Australia, have not called my children on their birthdays or made any effort to have any sort of relationship with me or my kids. And then she decided she can just drive over here and pick my daughter up from my home without even asking me for my permission..
I know I am missing something here, because my sister’s action really didn’t make any sense to me.
Why now?
Why all of a sudden?
Why work with my children’s feelings ( obviously Yaya was upset when I told her it doesn’t work like that. One needs to ask the parent for permission before taking the child!)

I wrote a very simple email to my sister and told her that I do not like her playing with my children’s feelings.
Now I am told that I use my children!
Now all three of my sisters are bombarding me with emails telling me that I am a loser, that they are waiting for me to run to them because they know it will happen one of these days..

I am so tired of my family.
I don’t write to them, I don’t call them.. All I am doing is trying to rebuild my life..they won’t let me even do that.