Thekla Clara Emilie Friedrich Ludwig was the ninth of ten children born to Julius John August Friedrich and Bertha Katharina Schick. Here is a list of those children.
- Edward Julius Friedrich
- Erna Friedrich
- Agnes Friedrich Duffal
- Edgar Friedrich
- Walter Friedrich
- Paul Friedrich
- Bertha Friedrich Gnuse
- Eleanor Friedrich Weber
- Thekla Clara Emilie Friedrich Ludwig
- Ruth Friedrich