With descriptions added to the back of the photograph:
1) in likely to be Klara Weltzel's hand:
Hans, Laluts’ & Junge

The above description also features shorthand or code.

2) in Hanns Weltzel's hand:
Lalun, Popo? u. Verwandter


Depicted in this photograph are:
Karl Laubinger (4) (front); Siegmund Laubinger (back)

Please refer to the table in GLS Add. GA 3 for additional details on these individuals, along with alternative names and spellings with which they may be identified.