Hello Dan,

Right. However, if we look into the Heymann Family tree we can see it's not "that" Mordecai Susskind ben Meir (b. c. 1370 who's purported to be a son of the Maharam. Instead, the Maharam's son is reported as: Suesskind ben Meir ROTHENBERG... In other words, the latter (Suesskind ben Meir Rothenberg) was the great grandfather of "the Mordecai Susskind ben Meir (b. c. 1370)" whom you refer to:

Direct Lineage from:  Meir ben Baruch Mahara"m Rothenberg  to:  Mordechai ben Meir Rottenberg          

1 Meir ben Baruch Mahara"m Rothenberg b. 1215 Worms (D) d. 1293 Ensisheim Alsace (F)
  m. Name Unknown

 2 Suesskind ben Meir Rothenberg b. CIR 1245
   m. Name Unknown

  3 Getschlik ben Suesskind Rothenberg b. _____
    m. Name Unknown

   4 Meir ben Getschlik Rothenberg b. _____
     m. Name Unknown

    5 Mordechai ben Meir Rottenberg b. _____
      m. Name Unknown

Kind regards,
Alan Ehrlich
Geneva, Switzerland