Johannes is getrouwd met Wilhelmina Mathilda Hubertina Tigchelman in 1908 (Civil) in 's Gravenhage. Wilhelmina (dochter van Jan Hendrik Hubert Tigchelman en Anna Catharina Derkinderen) is geboren in 1884 in 's Gravenhage; is gestorven in 1951 in 's-Gravenhage; is begraven in 1951 in 's-Gravenhage. [Gezinsblad] [Familiekaart]

1. Johannes Franciscus Ernst is geboren in 1909 in 's-Gravenhage.
2. Anna Wilhelmina Ernst is geboren in 1910 in 's-Gravenhage.