Whitney Houston’s sister-in-law Pat Houston has slammed makers of "Whitney", which is a biopic of the late singer’s life.

Pat lashed out at LifetimeTV and the TV movie’s director Angela Bassett in an open letter, reports mirror.co.uk.

In the letter posted on WhitneyHouston.com, Pat wrote: "I say this to all Whitney&’s family, friends and fan base: If you watch this movie, watch it knowing that Lifetime is notorious for making bad biopics of deceased celebrities and brace yourself for the worst.”

"What lifts up one person in the headlines may in fact destroy another. I don’t think it ever entered their minds that they were assaulting the legacy of another individual; they just want the job or the opportunity to shine," she added.

"But to do so in such an incredible way, to go after someone who cannot correct what you get wrong, someone who – like so many people, and especially women – struggled to hold up their humanity and live with dignity despite their personal challenges, is wrong.

"Never would Whitney allow her story to be told by an inexperienced team and how naive of anyone to think otherwise, unless you’re caught up in illusions of grandeur that you can just do anything and people will accept it. This made for TV movie is certainly not a trailer to Whitney&’s life story."