%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 7-4-19 on page 492.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.83385pt}
\StartShownPreambleCommands
\usepackage{xytree}
\StopShownPreambleCommands
\begin{document}
\xytree{
                & \xynode[1,-1]{IP}                                     \\
 \xynode[0]{NP} &                   & \xynode[-1,1]{I$^\prime$}         \\
 \xyterminal{John}
                & \xynode[0]{I$^0$} &           & \xynode[-1,1]{VP}     \\
                & \xynode{t$_i$}\xyconnect[->][_2pc](LD,L){1,1}
                                    & \xynode[0]{V$^{0}$}
                                                &    & \xynode[0]{NP}   \\
                &                   &\xynode[0]{V+INFL}
                                                &    & \xyterminal{Mary}\\
                &                   &\xyterminal{loves}
}
\qquad
\yytree{
 \yynode[1,4]{grandparents}   \\
  & \yynode[1,2]{ma \& pa}    \\
  &   & \yynode{brother}      \\
  &   & \yynode{sister}       \\
  & \yynode[1]{uncle \& aunt} \\
  &   & \yynode{cousin}
}

\end{document}