Jhr. Johan Maurits, Jhr. de Jonge ^{89,1986,1987,1988}

  Noted events in his life were:

• Occupation: ingenieur, werkt voor een houtkapmaatschappij op Sumatra.

Johan married Pauline Clasina Berg, daughter of Ernst Willem Berg and Arnoldina Adriana Lenting, on 12 Jul 1910 in Hilversum, North Holland, Netherlands. (Pauline Clasina Berg was born on 4 Apr 1886 in Amsterdam, Noord-Holland, Netherlands, died on 31 Jan 1981 in The Hague, The Netherlands and was buried on 4 Feb 1981 in Baarn, Utrecht, Netherlands.)