Elternsprecher erstellt Adressliste mit Mail, Telefon, Mutter, Vater -- ausführlich halt

\begin{filecontents*}{elternsprecher.adr}
\addrentry{Müller}{Leonard}{Müllerstraße 10\\ 16507 Berlin}
          {030~78554685}{}{Leonard@Müller.de}
          {MuellerFranka}{MuellerFranz}{MuellerLeonard}
\addrentry{Müller}{Franka}{Müllerstraße 10\\ 16507 Berlin}
          {030~78554685}{0176 458763325}{Franka@Müller.de}
          {MuellerFranka}{MuellerFranz}{MuellerFranka}
\addrentry{Müller}{Franz}{Müllerstraße 10\\ 16507 Berlin}
          {030~78554685}{0176 458763327}{Franz\_Peter@Müller.de}
          {MuellerFranka}{MuellerFranz}{MuellerFranz}
\end{filecontents*}
 
\documentclass[DIV=18,fontsize=10,pagesize]{scrartcl}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
 
\usepackage{scraddr}
\InputAddressFile{elternsprecher}
 
\newcommand*{\addrentry}[9]{%
  \ifstr{#7}{#9}{% selbst = Mutter, also ignorieren
  }{%
    \ifstr{#8}{#9}{% selbst = Vater, also ignorieren
    }{% selbst != Mutter AND selbst != Vater, also Kind
      \minisec{#2\nobreakspace #1}
      \begin{minipage}{\linewidth}% die ganze Familie zusammen halten
        \showvalues{#3}{#4}{#5}{#6}% Adresse, Telefon, E-Mail anzeigen
        \ifstr{#7}{}{% keine Mutter, also ignorieren
        }{%
          \medskip\hspace*{1em}\parbox[t]{\dimexpr \linewidth-1em\relax}{%
            \FirstName{#7}\nobreakspace\LastName{#7}\par
            \showvalues{\Address{#7}}{\Telephone{#7}}{\FreeI{#7}}{\FreeII{#7}}%
          }\par
        }%
        \ifstr{#8}{}{% kein Vater, also ignorieren
        }{%
          \medskip\hspace*{1em}\parbox[t]{\dimexpr \linewidth-1em\relax}{%
            \FirstName{#8}\nobreakspace\LastName{#8}\par
            \showvalues{\Address{#8}}{\Telephone{#8}}{\FreeI{#8}}{\FreeII{#8}}%
          }\par
        }%
      \end{minipage}\par
    }%
  }%
}
 
\newcommand*{\showvalues}[4]{%
  \strut{\renewcommand*\\[1][]{, }#1}\par\noindent
  \mbox{Festnetz: \ifstr{#2}{}{---}{#2}}, 
  \mbox{Mobil: \ifstr{#3}{}{---}{#3}}, 
  \mbox{#4}\par
}
 
\begin{document}
 
\input{elternsprecher.adr}
 
\end{document}