Castle Rock
... that Henry Fairfield Osborn almost doubled the size of Castle Rock, his father's Garrison, New York, mansion, to accommodate his family?
... that <a href="./Henry_Fairfield_Osborn" id="mwFu0" rel="mw:WikiLink" title="Henry Fairfield Osborn">Henry Fairfield Osborn</a> almost doubled the size of <b id="mwFu4"><a href="./Castle_Rock_(Garrison,_New_York)" id="mwFu8" rel="mw:WikiLink" title="Castle Rock (Garrison, New York)">Castle Rock</a></b>, his father's <a href="./Garrison,_New_York" id="mwFvA" rel="mw:WikiLink" title="Garrison, New York">Garrison, New York</a>, <a href="./Mansion" id="mwFvE" rel="mw:WikiLink" title="Mansion">mansion</a>, to accommodate his family?