When I use the \citet command, it makes a the & sign between the names. It is not supposed to do that, it is supposed to spell out 'and', which is the correct style for in-text citation. However, I have a further problem, which is that I write in Danish, and I need it to spell out 'og' between the names instead of and. I have been trying to find a danish.apc file, or to create one myself from the swedish.apc file. So far, I have been unsuccessful in both. I tried the solution suggested on a similar issue, where someone was writing in catalan: Change citation conjunction from "and" to "i"
The solution there suggested here, however, does not yield an acceptable result because the commands do not do what is written that they do.
The \renewcommand{\BBAA}{&} is supposed to change only the text in the references and between parantheses, that is, using the \citep command. But it also changes it within the text when using the \citetcommand. The \renewcommand{\BBAB}{og} command does nothing.
\documentclass[11pt]{memoir}
\usepackage[danish]{babel}
\renewcommand{\danishhyphenmins}{22}
\usepackage{apacite}
\usepackage[longnamesfirst]{natbib}
\renewcommand{\BBAA}{&}
\renewcommand{\BBAB}{og}
\begin{document}
\section{Citations}
If I cite \citet{smiths} using the '\citet' command then I get an \& sign rather than 'og'. Of course without it affecting the \citep command and writing 'og' within the parantheses instead of the correct sign \& \citep{smiths}.
\bibliographystyle{apacite}
\bibliography{refs}
\end{document}
Reference in the bib document:
@article{smiths,
author = {Smith, A. and Smith, B.},
journal = {Journal of Apacite},
number = {1},
pages = {24305--36811},
title = {{How do I change \& to 'and'}},
volume = {1},
year = {2014}
}

biblatexan option for you? – Johannes_B Nov 29 '14 at 16:25\citetthe & becomes “og” and in\citepit remains &? – egreg Nov 29 '14 at 16:28&be used for parenthetical citations (à la\citep) and in the bibliography entries, whereasand(orog, ori, ...) must be used for textual citations (à la\citet). – Mico Nov 29 '14 at 16:33