my $input = {
    'Sally Smith'   => { parents => ['Bob Smith',    'Rhonda Smith']},
    'Betty Freeman' => { parents => ['Earl Freeman', 'Harmony Ellis']},
    'Betty Boop'    => { parents => ['Rhonda Smith', 'Louis McFern']},
    'Jim Morris'    => { parents => ['Betty Boop',   'John Wayne']},
};