Hi Jan,
thanks for your question! About forefathers from the city of Quirl In dont know. (I never heard about this city before.) It seams, there werre many inhabitants with this name in Silesia. But perhaps we both have luck, if you write me the christian names and Years of birth of your forefathers named FÖRSTER. And if you are interesed, I can send you a map with the number of the owners of this name in each county of actual germany (source: www.verwandt.de) I am interested myself to learn more about relatives FÖRSTER from Silesia.
Kind regards from rainy Munich
Michael Förster
t rbehers> -----Ursprüngliche Nachricht-----