Royal marriages don't always have fairytale endings. That sad fact is known all too well after watching the marriage of Princess Diana and Prince Charles implode in the early 1990s.

But according to tell-all biographer Andrew Morton, the royal family could be in for a very happy time ahead thanks to the recent marriage of Prince William and Kate Middleton.

The fairytale thread runs through Morton's latest book, "William and Catherine: Their Story."

"William and Catherine are the future of the royal family," Morton told CTV.ca on Thursday as he sat before a display of evening gowns belonging to the late Princess Di at Toronto's Design Exchange.

"There's a lot riding on this couple's shoulders. But I think they've got the stuff to make their marriage work and keep the monarchy alive for a new generation," said Morton.

The reason why, according to Morton, comes down to psychology.

"Kate is a mother figure. William has been looking for a mother and found one. Simple as that," Morton said.

Like his mother before him, the prince is a child of divorce. He longed for real nurturing, just like Diana.

That's what Prince William found in Kate and the Middletons, who are a nurturing family by all accounts, according to Morton.

Diana's dream for Wills a 'poisoned chalice'

Inside the 224-page book, Morton chronicles the couple's early years, how they met, the highs and lows of their relationship, as well as details that lead to their engagement and spectacular wedding at Westminster Abbey last month.

The book also touches on certain sore spots for William and his new bride.

On page 53 Morton outlines William's anger at Diana for admitting to an affair with Major James Hewitt, which she began in 1986. That liaison was exposed in May of 1992 in Morton's sensational book, "Diana: Her True Story."

Diana later gave a TV interview in 1995 in which she confessed to her adultery with Hewitt.

Before the interview aired Diana visited William, then a student at Eton College, to explain her actions.

Morton writes, "A watching photographer captured the awkwardness of their exchange. William, it seemed, wanted nothing to do with his mother, his hurt plain and public."

"William's anger was very understandable," said Morton.

"Diana was telling her sons, ‘Oh, James is coming over to teach me to ride. But she had been duplicitous. She used the boys as human shields in her own affair. Frankly, Diana told me she wished she'd never revealed the truth. She regretted the pain it cost her boys."

Middleton's so-called gold-digging ways are also covered.

Morton writes about the unwelcome tabloid nicknames for Middleton and her younger sister, Pippa:

"The girls were dubbed the 'Wisteria sisters' in that they were, according to Tatler magazine, ‘highly decorative, terribly fragrant and have a ferocious ability to climb.'"

This nickname, along with the dreaded "Waity Katie," he writes, "Perfectly encapsulated a peculiarly British characteristic, a toxic combination of Puritanism and snobbery, tinged, perhaps, with envy."

"The press got it all wrong," said Morton.

"Catherine has all the qualities that tabloid journalists hate. She's discreet, loyal, cautious and steadfast. That doesn't make for shrieking headlines."

Middleton's reserve and composure have served her well.

"There are hidden depths to Catherine that will be revealed through the years," said Morton, who now launched the entertainment website, TheMortonReport.com.

"I don't think she'll be a hearts and flowers kind of princess the way Diana was. But she will be a force in her own way. Of that I am certain."

Morton also believes that William's new consort will never know greater sadness than Princess Diana.

Within the first year of her marriage Diana was trying to commit suicide, had bulimia and was jealous of her husband and his continuing affair with Camilla Parker-Bowles. She couldn't speak to anybody and felt desperately alone isolated.

"That just for starters," said Morton.

"You know, Diana talked to me a lot about her dreams for Prince William. She wanted the crown to pass a generation and go to him. She wanted him to be happy. He may not want that poisoned chalice yet of being king. But in Catherine he's got a real chance for happiness," said Morton.

"Catherine's gone from walking down the aisle at her wedding to walking down the aisle of their local supermarket shortly after. She's normal. Diana would have loved that."