Heath Ledger's sister Kate has praised Michelle Williams' parenting abilities.

The 36-year-old actress has been raising her 11-year-old daughter Matilda - whom she had with the late Brokeback Mountain star - on her own since Heath died from an accidental intoxication from prescription drugs in 2008, and now Heath's sister Kate has taken the time to praise the job she's done.

Actor Heath Ledger with wife Michelle Williams and daughter Matilda Rose Ledger leave Sydney International Airport. Photo / Getty
Actor Heath Ledger with wife Michelle Williams and daughter Matilda Rose Ledger leave Sydney International Airport. Photo / Getty

Kate said: "I think that she provides such a wonderful environment for Matilda to grow up in, especially in the sort of industry that she's in."

And The Dark Knight star's close friend Matt Amato dubbed the Manchester By The Sea actress as an "incredible mother".

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He said: "The way she's been an incredible mother, she has hero status all across the board."

Matilda Ledger is seen in the burough of Brooklyn on October 30, 2009 in New York City. Photo / Getty
Matilda Ledger is seen in the burough of Brooklyn on October 30, 2009 in New York City. Photo / Getty

Despite Matilda only being two-years-old when Heath died at the age of 28, Kate says there are striking resemblances between her late brother and his daughter.

Speaking for the cover of People magazine ahead the upcoming Spike TV documentary I Am Heath Ledger, Kate said:

"When [Matilda] picks up her pencil, it reminds me of Heath; when she walks, it reminds me of Heath; when she gets on her skateboard, it reminds me of Heath.

"I tell her about her daddy every time we see each other. I tell her little stories of him growing up and how he used to chase me with the cricket bat."

Meanwhile, Michelle previously admitted it "won't ever be right" to have to raise Matilda without her father.

Michelle Williams and Kate Ledger arrive at the Memorial Service for Heath Ledger. Photo / Getty
Michelle Williams and Kate Ledger arrive at the Memorial Service for Heath Ledger. Photo / Getty

She said: "In all honesty, for pretty much everything else, I feel like I'm a believer in not fighting circumstances, accepting where you are and where you've been.

"In pretty much all senses but one, I would be able to go totally down that line of thinking were it not for Matilda not have her dad."

Family of late actor Heath Ledger, mum, dad, and sister Kate. Photo / Getty
Family of late actor Heath Ledger, mum, dad, and sister Kate. Photo / Getty

"You know, that's just that something doesn't ... I mean, it just won't ever be right."

I Am Heath Ledger is set to debut at the Tribeca Film Festival on April 23.