\begin{tikzpicture}
\umlsimpleclass{A}
\umlemptyclass[x=-2, y=-2, anchor=north]{B}
\umlclass[x=2, y=-2, anchor=north]{C}{i : int \\ r : double}{}
\umlVHVinherit[arm2=-1.2cm]{B}{A}
\umlVHVinherit[arm2=-1.2cm]{C}{A}
\end{tikzpicture}