Karl Froebel was one of the five nephews of Friedrich Froebel, who were educated at the school founded in 1816 at Griesham.
Helene was the daughter of Karl and Johanna Froebel. In 1881 she was an assistant teacher living with her parents at 19 and 20 Moray Place, Edinburgh. Helene (now Helen) Froebel (spinster) was living at 167 and 169 Queens Road, Paddington London as a teacher of Music and German in 1911.