First: sorry, my english is not super, i'm dutch. You know by now. When you have buyed an account, you can give it to your daughters, BUT, they cannot play together because (when you have paid version) that username is already token. When you sure wanna play with all together, i recommend to use minecraft SP when you dont wanna buy it 3 times more. Okay, it is cracked, i dont use it so i dont know or it has any problems, but its free.