Brothers as authors - Biblatex does not format correctly

Question

so for my academic paper I have one book to cite from which is written by brothers (P. Hüwe & S. Hüwe). The citation style my university wants is for to authors to be diveded by a slash: (Hüwe/Hüwe 2019).

This citation stlye works, but unfortunatly not in this particular case where both authors share the same last name, because it also prints out their first names.

Here is my code:

\documentclass{article}
\usepackage[style=authoryear,maxcitenames=2,maxbibnames=99]{biblatex}
\DefineBibliographyStrings{ngerman}{ 
   andothers = {{et\,al\adddot}},             
} 
\DeclareNameAlias{sortname}{last-first}

\addbibresource{biblatex-examples.bib}



\begin{document}
\begingroup
\renewcommand*{\finalnamedelim}{/}
\renewcommand*{\multinamedelim}{/}

normal document text

\cite{Hüwe.2019} \\Doenst work
\cite{Yerpude.2019} \\works


\endgroup
\printbibliography
\end{document}

Anyone knows why this is?

Answer 1

The uniquename=false option takes care of this problem:

\documentclass{article}
\usepackage[style=authoryear,maxcitenames=2,maxbibnames=99, uniquename=false]{biblatex}
\DefineBibliographyStrings{ngerman}{ 
   andothers = {{et\,al\adddot}},             
} 
\DeclareNameAlias{sortname}{last-first}

\addbibresource{test.bib}


\usepackage{filecontents}
\begin{filecontents*}{test.bib}
@article{Huewe.2019,
    author = {Hüwe, P. and Hüwe, S.},
    title = {title},
    year = {2019}
}
\end{filecontents*}


\begin{document}
\begingroup
\renewcommand*{\finalnamedelim}{/}
\renewcommand*{\multinamedelim}{/}

normal document text

\cite{Huewe.2019} \\Doenst work



\endgroup
\printbibliography
\end{document}