Some interesting mathematical genealogy lines:
1) Jan Valdman - Martin Brokate - Karl-Heinz Hoffmann - Günter Hämmerlin - Henry Görtler - Harald Geppert - Adolf Kneser - Leopold Kronecker - Johann Franz Friedrich Encke - Carl Friedrich Gauß
2) Jan Valdman - Martin Brokate - Karl-Heinz Hoffmann - Ernst Wienholtz - Franz Rellich - Richard Courant - David Hilbert - C. L. Ferdinand Lindemann - C. Felix Klein - Rudolf Lipschitz - Gustav Dirichlet - Simeon Poisson - Joseph Lagrange - Leonhard Euler - Johann Bernoulli - Jacob Bernoulli - Gottfried Leibniz
MR Erdos Number = 4: