\documentclass{article}

\usepackage[en-US]{datetime2}
\usepackage[date=en-US,noindex]{nehgs-register}

\title{Getting Started with \textsf{nehgs-register}}
\author{}
\date{}

% Define two founding-generation persons
\definepersonkv{john-doe}{
  name        = {John Doe},
  preferred   = {John},
  parents     = {},
  sex         = {M},
  birth       = {1820-03-15},
  birth-place = {Boston, Massachusetts},
  death       = {1895-11-22},
  death-place = {Springfield, Massachusetts},
  occupation  = {farmer}
}

\definepersonkv{mary-smith}{
  name        = {Mary Smith},
  preferred   = {Mary},
  parents     = {},
  sex         = {F},
  birth       = {1825-06-20},
  birth-place = {Providence, Rhode Island},
  death       = {1900-01-05},
  death-place = {Springfield, Massachusetts}
}

% Define a second-generation child
\definepersonkv{james-doe}{
  name        = {James Henry Doe},
  preferred   = {James},
  parents     = {john-doe,mary-smith},
  lineage-parent = {john-doe},
  sex         = {M},
  birth       = {1850-11-02},
  birth-place = {Springfield, Massachusetts},
  baptism     = {1850-12-25},
  baptism-place = {First Church, Springfield, Massachusetts}
}

% Record the marriage
\addmarriage{john-doe}{
  spouse = mary-smith,
  date   = 1845-09-10,
  place  = {Springfield, Massachusetts}
}

\begin{document}
\maketitle

This document demonstrates the basic features of the
\textsf{nehgs-register} package.

\begin{registersection}

\generationheading{john-doe}

\mainperson{john-doe} was born \getpersonbirthdate{john-doe}
in \getpersonbirthplace{john-doe}.\registersource{%
  Massachusetts vital records, Town of Boston.}
\HeSheThey{john-doe} was a \getpersonoccupation{john-doe}
in Springfield.
\HeSheThey{john-doe} married
\getpersonname{mary-smith} on
\getmarriagedate{john-doe}{1} in
\getmarriageplace{john-doe}{1}.
\HeSheThey{john-doe} died
\getpersondeathdate{john-doe} in
\getpersondeathplace{john-doe}.

The child of \shortname{john-doe} and \shortname{mary-smith}:
\begin{childrenof}{john-doe}{mary-smith}
  \childref{james-doe}{b.~\getpersonbirthdate{james-doe},
    \getpersonbirthplace{james-doe};
    bp.~\getpersonbaptismdate{james-doe},
    \getpersonbaptismplace{james-doe}.}
\end{childrenof}

\generationheading{james-doe}

\mainperson{james-doe} was born \getpersonbirthdate{james-doe}
in \getpersonbirthplace{james-doe} and was baptized
\getpersonbaptismdate{james-doe} at
\getpersonbaptismplace{james-doe}.

\end{registersection}

\checkregister

\end{document}