Richard Butler
...that Richard Butler and his father were 31st and 23rd Premiers of South Australia, respectively?
...that <b id="mwBfU"><a class="mw-redirect" href="./Richard_Butler,_junior_(Australian_politician)" id="mwBfY" rel="mw:WikiLink" title="Richard Butler, junior (Australian politician)">Richard Butler</a></b> and his father were 31st and 23rd <a class="mw-redirect" href="./Premiers_of_South_Australia" id="mwBfc" rel="mw:WikiLink" title="Premiers of South Australia">Premiers of South Australia</a>, respectively?