Hi Ginny,
Here is the link to BaMF´s website regarding family reunification:
****://***.bamf.de/EN/Migration/Arbeiten/Familiennachzug/familiennachzug-node.html
So far as what I´ve read on the website, the family reunification process are for parents wishing to send for their children or spouse, or for those 18-years-old or younger who wish to send for their parents. Being 18 seems to then disqualify you for bringing your family to Germany, but I would maybe contact the Refugee Law Clinic group to verify and see if they know of any other options.
Here is a map of Refugee Law Clinics in Germany. Where do you live right now?
****://***.rlc-network.org/#members