Harry and Meghan's royal wedding "tore the Markle family apart", the bride's nephew has claimed.
Tyler Dooley said he wanted to "set the record straight" about his relatives while app- earing on a reality TV show.
The 25-year-old medicinal-use cannabis farmer def- ended Meghan's father, his grandfather, saying he "worked hard for my whole family my whole life".
Mr Dooley said Prince Harry was "a pretty cool guy" and he was happy Meghan had found "someone that she loves".
Appearing on MTV's the Royal World, Mr Dooley described himself as a "farm boy" who grew up seeing Megh- an "as a sister".
In conversation with another cast member, it was also revealed that Harry used the pseudonym "Gary" in the past when meeting strangers.
Mr Dooley's father is Meghan's brother, but because they are no longer on speaking terms he uses his mother's surname.
When Meghan started dating Harry, it began what Mr Dooley described as a "really tough journey" for his family.
"My family has been torn apart," he said. "Had we some guidance and assistance, perhaps from the royal family, we could have avoided a lot of this stuff."
Meghan's extended family have hit the headlines on numerous occasions for public comments about her wedding and her relationship with them.
The Duchess of Sussex was walked down the aisle by Prince Charles after her own father was unable to attend.
"Obviously he should have been there to walk his daughter down the aisle, he's her father," Mr Dooley said. "He loves her more than anything in the world."
Mr Dooley said his whole family thought they would be invited to the wedding, only for Meghan's mother Doria Ragland to be the sole representative.
"Your family that was raised with you, you can't forget them," he said. "It doesn't matter if it's a royal wedding or whatever, but I'm just happy that she found someone she loves."
During the second episode of Royal World, cast member Jessica Heydel described an encounter with Prince Harry.
"He was introduced to me as Gary or something like that," she said. "I thought, he doesn't want me to know who he is but obviously I know who he is.
"He was asking me all these questions and I literally could not say a word."
It was reported in May that Mr Dooley had allegedly tried to enter a nightclub carrying a knife while visiting London at the time of the royal wedding.
He said "vicious headlines" about him had been "hard" to take and he had been pushed to "breaking point".
Mr Dooley said Meghan had come from "humble beginnings" but praised her for being a good role model, especially for women.
"We used to idolise her as kids," he said. "Her personality is unreal, she's phenomenal."
The Royal World is on MTV every on Wednesdays at 10pm.