\documentclass{article}

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

\title{Multi-Marriage Example}
\author{nehgs-register example}
\date{}

% A person with two marriages

\definepersonkv{thomas-ward}{
  name        = {Thomas Ward},
  preferred   = {Thomas},
  parents     = {},
  sex         = {M},
  birth       = {1800-04-12},
  birth-place = {Hartford, Connecticut},
  death       = {1870-08-30},
  death-place = {New Haven, Connecticut}
}

\definepersonkv{sarah-clark}{
  name        = {Sarah Clark},
  preferred   = {Sarah},
  parents     = {},
  sex         = {F},
  birth       = {1805-02-18},
  birth-place = {New London, Connecticut},
  death       = {1840-06-15},
  death-place = {Hartford, Connecticut}
}

\definepersonkv{elizabeth-brown}{
  name        = {Elizabeth Brown},
  preferred   = {Elizabeth},
  parents     = {},
  sex         = {F},
  birth       = {1815-09-03},
  birth-place = {Middletown, Connecticut},
  death       = {1885-12-20},
  death-place = {New Haven, Connecticut}
}

% Children from first marriage
\definepersonkv{william-ward}{
  name        = {William Henry Ward},
  preferred   = {William},
  parents     = {thomas-ward,sarah-clark},
  lineage-parent = {thomas-ward},
  sex         = {M},
  birth       = {1830-07-04},
  birth-place = {Hartford, Connecticut}
}

\definepersonkv{anna-ward}{
  name        = {Anna Maria Ward},
  preferred   = {Anna},
  parents     = {thomas-ward,sarah-clark},
  lineage-parent = {thomas-ward},
  sex         = {F},
  birth       = {1833-01-22},
  birth-place = {Hartford, Connecticut},
  death       = {1835-03-10},
  death-place = {Hartford, Connecticut}
}

% Children from second marriage
\definepersonkv{charles-ward}{
  name        = {Charles Edward Ward},
  preferred   = {Charles},
  parents     = {thomas-ward,elizabeth-brown},
  lineage-parent = {thomas-ward},
  sex         = {M},
  birth       = {1845-11-15},
  birth-place = {New Haven, Connecticut}
}

\definepersonkv{mary-ward}{
  name        = {Mary Jane Ward},
  preferred   = {Mary},
  parents     = {thomas-ward,elizabeth-brown},
  lineage-parent = {thomas-ward},
  sex         = {F},
  birth       = {1848-03-28},
  birth-place = {New Haven, Connecticut}
}

% Record both marriages
\addmarriage{thomas-ward}{
  spouse = sarah-clark,
  date   = 1828-10-20,
  place  = {Hartford, Connecticut}
}

\addmarriage{thomas-ward}{
  spouse = elizabeth-brown,
  date   = 1843-05-12,
  place  = {New Haven, Connecticut}
}

\begin{document}
\maketitle

This example demonstrates the multi-marriage support in
\textsf{nehgs-register}.

\begin{registersection}

\generationheading{thomas-ward}

\mainperson{thomas-ward} was born \getpersonbirthdate{thomas-ward}
in \getpersonbirthplace{thomas-ward}.
\HeSheThey{thomas-ward} married first
\getpersonname{sarah-clark} on
\getmarriagedate{thomas-ward}{1} in
\getmarriageplace{thomas-ward}{1}.
\getpersonname{sarah-clark} died
\getpersondeathdate{sarah-clark} in
\getpersondeathplace{sarah-clark}.
\getpersonname{thomas-ward} married second
\getpersonname{elizabeth-brown} on
\getmarriagedate{thomas-ward}{2} in
\getmarriageplace{thomas-ward}{2}.
\HeSheThey{thomas-ward} died
\getpersondeathdate{thomas-ward} in
\getpersondeathplace{thomas-ward}.

Children of \shortname{thomas-ward} and
\shortname{sarah-clark} (first marriage):
\begin{childrenof}{thomas-ward}{sarah-clark}
  \childref{william-ward}{b.~\getpersonbirthdate{william-ward},
    \getpersonbirthplace{william-ward}.}
  \child{anna-ward}{b.~\getpersonbirthdate{anna-ward},
    \getpersonbirthplace{anna-ward};
    d.~\getpersondeathdate{anna-ward},
    \getpersondeathplace{anna-ward}.
    Died young.}
\end{childrenof}

Children of \shortname{thomas-ward} and
\shortname{elizabeth-brown} (second marriage):
\begin{childrenof}{thomas-ward}{elizabeth-brown}
  \childref{charles-ward}{b.~\getpersonbirthdate{charles-ward},
    \getpersonbirthplace{charles-ward}.}
  \childref{mary-ward}{b.~\getpersonbirthdate{mary-ward},
    \getpersonbirthplace{mary-ward}.}
\end{childrenof}

\generationheading{william-ward}

\mainperson{william-ward} was born
\getpersonbirthdate{william-ward} in
\getpersonbirthplace{william-ward}.

\mainperson{charles-ward} was born
\getpersonbirthdate{charles-ward} in
\getpersonbirthplace{charles-ward}.

\mainperson{mary-ward} was born
\getpersonbirthdate{mary-ward} in
\getpersonbirthplace{mary-ward}.

\end{registersection}

\checkregister

\end{document}