Mahns/Ahders

My paternal Grandparents are Walter Ludwig Mahns born in 1881 to a Ludwig Mahns and Marie Kerner in Hamburg Germany. Would like to find out any information about Ludwig and Marie and if there are any Mahns relatives around related to a Carl and Frieda Mahns with a son named Fritz (circa 1920's). Carl is Walter's brother who stayed in Hamburg and didn't immigrate to the US.

Elise Ahders was born in 1887 in Osterwanna, Germany. I don't know her parents names or any relative information about her.
I'd love to hear from any Ahders or Mahns relatives and exchange information.
Thanks in advance.
Elise Mahns Brand