Sort of.
His dad started the Oriental Trading Company in 1932. It was successful, but Terrence took over in 1977 and brought the company to the next level, shifting focus away from solely providing goods to carnivals. Terrence ran it for 23 years, until 2000, at which point he sold his interest.
Then he chunked it all off in the next 7 years, especially in the mid-2000s.
He accounted for 5.6% of all of Caesars corporation's earnings in 2007.
He actually sold his stake at just the right time (2000), as the surge of internet shopping that decade (and the subsequent decade) was a killer to mail-order catalogs.