August Carl Reissig 1824,Children Henry,Paul,Sedonie,Rudolph Reissig

August Carl Reissig b.1824 had four Children Henry b.1850,Sedoine b.1854,Paul b.1858.Rudolph unknown birth date. The first three came to USA and I have info on them. Rudolph stayed in germany I have very little info on him. The family was from Zschoppichen/MittweidaGermany but Rudolph is said to have moved to Berlin and a letter from his daughter to Sedoine in usa was postmarked from Berlin.
The daughter who worte the letter was Margarethe and she mentioned a sister Eva .Another child was Hannel possibly a son Muse and or Karl. Margarethe used the last name Wallock in the letter.
Anyone have info on Rudloph Reissig family in Berlin.
Robin