I can't tell you whether your decision is best or not, not knowing all the factors, but I will back up duet30 that it is YOUR decision to make, while hearing from the Lord. I know it might be tougher for a single mom being on the receiving end of their 'grief' - but you can NOT make your decision based on the extremely limited understanding and vision of a 10 and 12 year old.
I speak from experience: my parents drug me at 5 and 12 to very different states, and I've done it 3 times now to my kids - and may do it to them again in their most 'social' years. I know what they'll complain about, but it won't move me. I still remember running out of the kitchen, throwing down the towel that I was helping my mom to dry the dishes with, when she told me we were moving to rural Pennsylvania from our wonderful 3 acre property in south Orlando, with dozens of friends close by. ("You can go, but I'm staying here!!") I didn't forgive them for that one for a long time! But I loved them, and never doubted they wanted what was best for me. Your girls will do the same. Don't let their fear rule, instead redirect it. It is
impossiblefor them to remotely perceive how the grass could possibly be greener somewhere else, if they've never actually experienced living elsewhere. But it is, it's always greener! I've got wanderlust in my bones, and I'm getting happy feet again myself!
Nathan
PS. I got the last laugh on my parents - moved back to Florida, twice, and got them come the last time, too - so now we live a few miles apart, a few miles from where I grew up.