Thank you for your response, Magda. Unfortunately, this is all the information I have, what was on his death certificate -- I do not know whether he had siblings. Also, he did not emigrate to the US; at some point he moved west, living in Bremerhaven, maybe in Bremen. He died in Goettingen, an inmate in what was called the "lunatic asylum" at that time.
When I look on Family Search, I find two Anton Langers born at a time when Maximilian's father could have been born:
Anton Franz Andreas Langer, christened 29 Mar 1817 in Neisse, parents Clemens Langer and Elisabeth Gebauer
Anton Carl Ernst Langer, christened 27 Apr 1816 in Neisse, parents Felix Langer and Rosalia Hunecke
But I can't find any record of the birth of Max Langer in Oberglogau/Glogowek.
Are there records of guild membership anywhere? Anton was a master weaver.
Thanks for your help,
Elise