Trying to figure out how to apply a nesting of \newenvironment in a manner reminiscent of OO inheritance (at least, that's the way it stacks in my brain)

newenv_problem.tex

\newenvironment{someSection}{%
    % some \newcommands go here
    \header{Some Section}%
    \addvspace{\vpad}%
    \begin{adjustwidth}{\extraMargin}{\extraMargin}%
}{%
    \end{adjustwidth}%
    \addvspace{\vpad}%
}

\newenvironment{someOtherSection}{%
    % some different \newcommands go here
    \header{Some Other Section}%
    \addvspace{\vpad}%
    \begin{adjustwidth}{\extraMargin}{\extraMargin}%
}{%
    \end{adjustwidth}%
    \addvspace{\vpad}%
}

% having noticed that my \addvspace and adjustwidth environments were repeated,
% I decided to make the following environment, but I can't figure out how to
% apply it.

\newenvironment{thinpara}{%
    \addvspace{\vpad}%
    \begin{adjustwidth}{\extraMargin}{\extraMargin}%
}{%
    \end{adjustwidth}%
    \addvspace{\vpad}%
}

% it almost seems like macros that individually expand to \begin and \end
% would be easier/more possible in general:

\newcommand{\thinStart}{%
    \addvspace{\vpad}%
    \begin{adjustwidth}{\extraMargin}{\extraMargin}%
}

\newcommand{\thinEnd}{%
    \end{adjustwidth}%
    \addvspace{\vpad}%
}