Thomas Jnr, 51, who is the American actress' half-brother has warned the 33-year-old royal to ditch the May 19 union with 'Suits' actress Meghan

Meghan Markle's estranged half-brother has shared a handwritten letter telling Prince Harry it's 'not too late' to cancel the wedding to his sister.

Elder sibling Thomas Markle Jr has warned the 33-year-old royal to ditch the May 19 union with the 'Suits' actress.

Mr Markle slammed the American star, insisting that 36-year-old Meghan is a 'jaded, shallow, conceited woman that will make a joke of you and the royal family heritage.'

The letter, shared with In Touch magazine reads: 'As more time passes to your royal wedding, it became very clear that this is the biggest mistake in royal wedding history.'

'Meghan Markle is obviously not the right woman for you.

'I'm confused why you don't see the real Meghan that the whole world now sees.

'Meghan's attempt to act the part of a princess like a below C average Hollywood actress is getting old.'

The 51-year-old, who is from Oregon in the US, then went on to claim that their father went into debt in order to support Markle's acting dream and is still struggling financially.

He also claims that their father was not invited to the wedding.

In a letter sent to In Touch, Mr Markle slammed the American star, insisting that 36-year-old Meghan is a 'jaded, shallow, conceited woman that will make a joke of you and the royal family heritage'

The 51-year-old, who is from Oregon in the US, then went on to claim that their father went into debt in order to support Markle's acting dream and is still struggling financially in a letter he sent to In Touch

'What kind of person starts out by using her own father until he's bankrupt, then forgets about him in Mexico leaving him broke, over mostly all her debts,' the letter continued.

'And when it's time to pay him back she forgets her own father like she never knew him.

'It's very apparent that her tiny bit of Hollywood fame has gone to her head.

The letter by Mr Markle, shared with In Touch magazine reads: 'As more time passes to your royal wedding, it became very clear that this is the biggest mistake in royal wedding history'. The couple is seen here last month

'Not to mention, to top it all off, she doesn't invite her own family and instead invites complete strangers to the wedding. Who does that? You and the royal family should put an end to this fake fairytale wedding before it's too late.'

Mr Markle finished with: 'Meghan is still my sister. She is family. So whatever happens is up to her, whether she wants to forget knowing me or the rest of her family, family comes first.

'Also, you would think that a royal wedding would bring a torn family closer together, but I guess we're all distant family to Meg.'

Meghan's half-brother has previously hit out at his sibling after revealing that her royal wedding snub has 'torn the family apart'.

Meghan Markle's brother Thomas' open letter to Prince Harry in full Dear Prince Harry, It’s not too late, Meghan Markle is obviously not the right woman for you. As more time passes to your royal wedding, it became very clear that this is the biggest mistake in royal wedding history. I'm confused why you don't see the real Meghan that the whole world now sees. Meghan's attempt to act the part of a princess like a below C average Hollywood actress is getting old. What kind of person starts out by using her own father until he's bankrupt, then forgets about him in Mexico leaving him broke, over mostly all her debts. And when it's time to pay him back she forgets her own father like she never knew him. My father will never recover financially from paying Meghan’s way, nor emotionally from disowning him. Meg is showing her true colours. It's very apparent that her tiny bit of Hollywood fame has gone to her head, changing her into a jaded, shallow, conceited woman, that will make a fool of you and the royal family heritage. Not to mention, to top it all off, she doesn't invite her own family and instead invites complete strangers to the wedding. Who does that? You and the royal family should put an end to this fake fairytale wedding before it's too late. Her own father didn’t get an invite, whom should be walking her down the aisle. She forgets if it wasn’t for my father she would be busing tables and babysitting to pay her old debt off. The whole world is watching Meg make bad decisions and choices, it’s not too late Harry. Meghan is still my sister. She is family. So whatever happens is up to her, whether she wants to forget knowing me or the rest of her family, family comes first. Also, you would think that a royal wedding would bring a torn family closer together, but I guess we're all distant family to Meg. Sincerely Tom Markle Jr Advertisement

Mr Markle accused his sibling of turning her back on the family and said she is 'falsely' trying to portray herself as the new Princess Diana.

He told the Daily Mirror: 'She's clearly forgotten her roots. It's torn my entire family apart. Meg likes to portray herself as a humanitarian, a people's person and a charitable person but she is none of those things to her family.

Extended family: Meghan has been estranged from most of her dad's side of the family for years. Above she is pictured as a young girl with her father Thomas Markle, Thomas Markle Jr's son Thomas and Tyler Dooley, and his ex-wife Tracey Dooley

'She is giving the greatest ­performance of her life. She is acting phoney. I've read that Meg wants to be like Diana.

'Diana was worshipped by everyone in the world. She was loved for the right reasons.

'That's what Meg wants, but I don't think that's going to happen. She's not genuine like Diana.'

Mr Markle has not seen his sister since 2011 when the pair – and Meghan's film producer ex Trevor Engleson, 41 – attended the Los Angeles funeral of their grandmother, Doris.

Markle believes that his brushes with the law may have embarrassed his half sister who is avoiding him.

He was in the news at the start of the year when he was thrown in jail for two days for a drunken brawl with his fiancee Darlene Blount on New Year's Eve.

Last year Markle was also arrested for brandishing a gun at his fiancee during another drunken fracas, although the charges were later dropped.

He blamed his behaviour on struggling to cope with the extra pressure and scrutiny he and the rest of his family have faced since Meghan's royal engagement.