He is married to Anna Catharina Goseling.
Permission for the marriage has been obtained in Amsterdam on March 25, 1796.Source 1
They were married in church on May 8, 1796 at den Helder.Source 2Ondertrouw op 25 maart 1796 te Amsterdam
Johann Mullens en Anna Catherina Goseling te den Helder
Trouwen op 8 mei 1796 te Den Helder Johannes Mullens en Anna Catherina Goseling
Opmerking: hij is quartiermeester op 's lands schip de admiraal de Ruijter gecommandeerd door capitein A. Holland bruidegom in kl. pro deo, zij is van amsterdam
Child(ren):