When Johannes Grob was born on 26 June 1829, in Ebnat-Kappel, Sankt Gallen, Switzerland, his father, Thomas Grob, was 44 and his mother, Regula Bommeli, was 42. He married Anna Katharina Riemensberger on 19 October 1858, in Ebnat-Kappel, Sankt Gallen, Switzerland. They were the parents of at least 1 son and 2 daughters. He died on 23 February 1904, in Ebnat-Kappel, Sankt Gallen, Switzerland, at the age of 74.