\begin{jtree}[xunit=3em, yunit=4ex]

\def\feat#1{\sc[#1]}%
\def\\{[labelgapb=-.75ex]}%

\! = {C}
     <left>[scaleby=1.5 1]{C}\\{\feat{t}}
    ^<right>[scaleby=1.5 1]{T}
     <left>[scaleby=2.125 1] !Subj
    ^<right>[scaleby=2.125 1]{T}\\{\feat{epp:\,d}}
     <left>[scaleby=1.875 1]{T}\\{\feat{epp:\,d,\,v}}\\{\emph{will}}
    ^<right>[scaleby=1.875 1]{V}
     <right>[scaleby=2.5 1] !PP
    ^<left>[scaleby=2.5 1]{V}
     <left>[scaleby=1.25 1]{D\rlap{$_m$}}(<vartri>{<\emph{my sister}>})   
    ^<right>[scaleby=1.25 1]{V}\\{\feat{d}}
     <left>[scaleby=1.0 1]{V}\\{\feat{d,\,d}}\\{\emph{decorate}} 
    ^<right>[scaleby=1.0 1]{D}
     <left>[scaleby=0.75 1]{D}\\{\feat{n}}\\{\emph{the}}
    ^<right>[scaleby=0.75 1]{N}\\{\emph{bedroom}}.

\!Subj = {D\rlap{$_m$}}
     <left>[scaleby=0.75 1]{D}\\{\feat{n}}\\{\emph{my}} 
    ^<right>[scaleby=0.75 1]{N}\\{\emph{sister}}.

\!PP = {P}\\{\feat{v}}
     <left>{P}\\{\feat{v,\,d}}\\{\emph{on}} 
    ^<right>{D}
     <left>[scaleby=0.75 1]{D}\\{\feat{n}}\\{\emph{the}}
    ^<right>[scaleby=0.75 1]{N}\\{\emph{weekend}}.

\end{jtree}