%% 
%%  A DANTE-Edition example
%% 
%% 
%%  Copyright (C) 2011 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}

\usepackage{pst-tree}
\SpecialCoor

\begin{document}
\pstree[treemode=R,levelsep=*1cm]{\Tr{Friedrich Wilhelm\rnode{A}{}}}{%
  \pstree{\Tr{Friedrich I.}}{%
    \Tr{Friedrich Wilhelm I.}
    \Tr{Friedrich}}
  \pstree{\Tr{\rnode{B1}{}Albrecht Friedrich\rnode{C}{}}}{%
    \Tr{\rnode{B2}{}Wilhelm Heinrich}
    \Tr{Friedrich}}}
\psset{arrowscale=2,linewidth=0.2pt}
\pcline[linestyle=dashed](A)(A|0,-1)  \pcline[linestyle=dashed](B1)(B1|0,-1)
\pcline[linestyle=dashed](B2)(B2|0,-1)\pcline[linestyle=dashed](C)(C|0,-1)
\pcline{<->}(A|0,-0.8)(B1|0,-0.8)\ncput*{\footnotesize 1cm}
\pcline{<->}(B2|0,-0.8)(C|0,-0.8)\ncput*{\footnotesize 1cm}
\end{document}