Michelle Williams' father has cast doubt on the handling of Heath Ledger's estate by the late star's dad KIM, and has called for the family to publicly state the true value of the actor's personal fortune. The Brokeback Mountain actor left all of his assets to parents Kim and Sally and older sister Kate, having filed his will in Australia in April 2003 - two years prior to birth of his daughter, Matilda, with then-girlfriend, actress Williams. Kim has since assured that both Williams and two-year-old Matilda will be financially "taken care of", but Larry Williams wants to know exactly how much Heath was worth at the time of his death so that his girls are not cheated out of any money. A series of documents filed in Manhattan, New York's Surrogate's Court earlier this month (Mar08) shows Ledger had less than $145,000 (GBP72,500)-worth of assets in New York at the time, including a $25,000 (GBP12,500) Toyota Prius and $20,000 (GBP10,000) in furniture. But Larry is sure Heath had other riches, which the family have yet to declare. Speaking to Australia's The Sunday Telegraph, Larry says, "It's real simple: just come clean with everything. It's so easy to resolve this. "He just has to say where the income went and where the assets are. I'm certain that there is grieving in the Ledger family but (lawyers for) Kim have already filed papers in New York, so it seems like it's time to be transparent about it. I have no idea what Heath Ledger was worth (but) they certainly haven't stated all of the assets to the court.'' The Ledger family has yet to respond to Larry's calls and actress Williams has also remained tight-lipped about her ex-fiance's will. Larry's demand comes just days after Heath's uncles expressed fears about Kim's ability to manage Heath's estate adequately, citing his bad track record of financial management. Heath Ledger suffered a fatal accidental overdose of prescription drugs in his New York apartment on 22 January (08). He was 28.