Meghan Markle's half-brother pens open letter to Harry

Markle's estranged half-brother is encouraging Prince Harry to call off his May 19 wedding to Markle.
3:30 | 05/04/18

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Transcript for Meghan Markle's half-brother pens open letter to Harry
We move on to our cover story. A message from Meghan Markle half brother writing an open letter urging prince Harry to call off the royal wedding. Adrienne Bankert here with the details. Hey to you all, as well. Good morning. And in the midst of this dream come true for Meghan her half brother says he has a warning for the prince. Her parents and siblings continue to be a huge part of this international love story. This morning, the complicated relationship between Meghan Markle and her family in full focus. Her estranged half brother Tom Markle is coming out with nasty words to prince Harry suggesting the prince should call offer the fairy tale wedding to Meghan describing it as the biggest mistake in royal history. He says I'm confused why you don't see the real Meghan that the whole world now sees. Meghan's atact to act the part of a princess like a below C average Hollywood actress is getting old. For Meghan it's been extremely embarrassing having this kind of attention on a half sibling she has no relationship. At a time when she's establishing herself as a future member of the British royal family, it's not what she needs. Reporter: In an open letter handwritten on notepad paper with the misspelled word of to in the first like and published in the gossip magazine "In touch" he goes on to says, what kind of a 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. The last time Meghan actually spent time around Thomas Jr. Was when she was a toddler and lived in the same home then she was raised as an only child in California by her parents Doria and Thomas and their relationship has been estranged since then. It's only since her relationship with Harry started that he has shown interest in getting contacted. He was arrested for assault with a gun last year and later apologized. Also been up front about his struggle with alcohol. Thomas has a rather checkered past and we've seen him over the last year and a half make several attempts and threats to Meghan and kensington palace aides asking for financial support and really just doing anything he can to get money from the tabloids. Reporter: Neither Markle's half brother or half sills ter is invited to the wedding. Meghan hasn't invited any extended relatives either. Only her mother Doria and her father Tom Sr. Who is flying in from Mexico are invited. Despite the half brother's claims we should see daddy and momma at the wedding. Maybe the imperfection of his family that has endeared us to this soon-to-be duchess. I mean, but, ooh. Planning a wedding, the fact that everybody is watching you and now this. Thank you. You'll be there, right? I'll be there. You'll be there. Michael will be there. A whole of us will be there.

This transcript has been automatically generated and may not be 100% accurate.

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