Hilton is also an heiress to a part of the Hilton Hotels chain , as well as to about 5 â `` 15 % of her father 's real estate fortune and investments . She shares her nickname with her grandfather 's brother , Conrad `` Nicky '' Hilton , who died 14 years before she was born . She is a great-granddaughter of Conrad Hilton ( founder of Hilton Hotels ) .