Lohn-Family in Germany 1963

Hello, I am posting from Germany because I just found an old picture (from August 1963) with a remark from my Grandma. She wrote down "The whole Family Lohn (from America)". I am located in Opladen / Leverkusen (it is near Cologne). On this picture there are (I assume) two families with 5 children (two boys and one girl). The girl is very small so that I think that this girl will be now approximately 40 years old. The two boys were older (now up to 50). The German family names connected with this meeting could be : Hermes, Wiechert, Nöller.
Don´t hesitate to contact me via mail : wvwie@yahoo.de - I will send you the picture as soon as I have it in data.
Gruss
Stefan Wiechert