Welcome to our community and thank you for your question.
We had a question that is similar to yours here on Wefugees recently. Please check out the information provided here:
Unfortunately you are in a very precarious situation and even if your children were born in Germany it doesn't grant them (or you) a right to stay. That's why I can only highly recommend you to get in touch with a local counselling center or (if you can afford it) a lawyer that takes a closer **** at your case. Since your deportation is imminent it's important that you get immediate help. If you tell us where you live we can do some research about organisations that might be able to advise you.