In the Nederlandsch Tijdschrift voor Tandheelkunde (1946), a list of dentists killed in the war appears on pp. 118-119. Leo Franken was among them.
This person lived alone or no information about family members is known or traceable.
In addition, a Jokos file (number 5734) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.