biblatex: nur erst author mit et al. im text

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backend=biber,
natbib=true,
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useauthor=true,
style=authoryear,
maxbibnames=25,
minbibnames=25
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\begin{filecontents}{\jobname.bib}
@Article{Meieretal2012,
  Title                    = {Tilte1},
  Author                   = {Meier, K.L. and Schulz, A.U. and Name, W.B. and anothername, E.E.},
  Journal                  = {Journal1},
  Year                     = {2012},
  Number                   = {12},
  Pages                    = {1777--1791},
  Volume                   = {38},
  Timestamp                = {2015.04.27}
}

@Article{Meieretal1997,
  Title                    = {Title2},
  Author                   = {Meier, K.L. and Muller, A.U. and Schulz, W.B. and Name, E.E.},
  Journal                  = {Journal2},
  Year                     = {1997},
  Number                   = {12},
  Pages                    = {1777--1791},
  Volume                   = {38},
  Timestamp                = {2015.04.27}
}

@Article{MeierSchulz1989,
  Title                    = {Title3},
  Author                   = {Meier, K.L. and Schulz, A.U.},
  Journal                  = {Journal},
  Year                     = {1989},
  Number                   = {12},
  Pages                    = {1777--1791},
  Volume                   = {38},
  Timestamp                = {2015.04.27}
}
\end{filecontents}

\begin{document}

bla \citet{Meieretal1997} bla \citet{Meieretal2012} bla \citet{MeierSchulz1989} bla

\printbibliography[heading=bibintoc]
\end{document}
%heading=bibintoc,