Meghan Markle's family: Breaking down their complicated dynamic ahead of the royal wedding

Who knew a royal wedding could be this dramatic?

Before this week, everything was going swimmingly for Prince Harry and Meghan Markle ahead of their upcoming royal wedding on Saturday, May 19, inside St. George's Chapel at Windsor Castle, but things have quickly changed ahead of their big day.

After a dramatic back-and-forth around whether or not Meghan's father, Thomas Markle, would be at the wedding to walk her down the aisle amid heart health concerns, Meghan confirmed on Thursday -- two days before the nuptials -- that Thomas would, in fact, not be in attendance.

But her daddy drama isn't the first controversy drummed up by her estranged family members. Ever since Meghan and Harry brought their romance into the international spotlight, Meghan's half siblings -- along with their exes and children -- have been causing a stir with constant interviews and allegations against her. Amid all the noise, it's been difficult to keep track of who's who, so we're breaking it down for you right here.

SEE ALSO: Meghan Markle officially announces her dad won’t be at wedding: Read her statement

Thomas Markle, Meghan's father: Thomas got married to Meghan's mother, Doria Ragland, in 1979 after meeting on the set of "General Hospital." They divorced in 1987. He was a lighting director in Hollywood on shows like "Married With Children" and "General Hospital," for which he won a Daytime Emmy award for in 2011. He now lives a reclusive life in Mexico and was reportedly in a "good place" with his daughter before causing a stir with staged paparazzi photos ahead of her wedding. After suffering a heart attack and undergoing heart surgery, Thomas was deemed unfit to fly to the wedding. He has never met Prince Harry.

Doria Ragland, Meghan's mother: Doria was a social worker at a non-profit mental health clinic with a specialization in the geriatric community before recently quitting her job ahead of her daughter's wedding. She was able to attain her license through a master's program at the University of Southern California, which Meghan helped fund. She is also a yoga instructor on the side. She met Prince Harry when the British royal flew out to Los Angeles before he and Meghan got engaged. She's expected to walk her daughter down the aisle.

SEE ALSO: Meghan Markle’s mom Doria Ragland quits her job before royal wedding

Samantha Markle (or Samantha Grant), Meghan's half-sister: Samantha shares a father with Meghan and lives in Florida. Different sources make various claims about the nature of her relationship with Meghan: Some (including Samantha) claim that Samantha, 17 years Meghan's senior, was integral in raising her, while others say they never lived in the same household. Samantha is in a wheelchair because of a 2008 diagnosis with multiple sclerosis. She's not invited to the wedding and has been an outspoken critic of Meghan for nearly two years now. She reportedly got into a car crash days before the royal wedding after an altercation with paparazzi.

Thomas Markle, Jr., Meghan's half-brother: Also not invited to the royal wedding, Thomas Jr. shares a father with Meghan in Thomas Sr. He's also not very close to Meghan, and the two reportedly haven't been in contact for years. He's given various exclusive interviews about his half-sister, though, calling her out for shunning the rest of her family after she entered Hollywood. He shares two sons with Tracy Dooley, who he was married to for 11 years, and he was arrested last year after reportedly holding a gun to a woman's head after a drunken argument.

Tracy Dooley, Meghan's half-brother's ex-wife: Tracy hasn't spoken to Meghan in nearly 20 years, but she was tapped to be a royal wedding correspondent for "Good Morning Britain" nonetheless, before the program reportedly dropped her after she flew to London for the gig.

Thomas Dooley (TJ), Meghan's nephew: Thomas is reportedly a manager at a Domino's, and Meghan used to babysit for him and his younger brother, Tyler, when they were infants. He's not invited to the wedding, but is in London along with his mother and brother.

Tyler Dooley, Meghan's nephew: Tyler is the son of Tracy and Thomas Jr., and he runs a legal marijuana farm in Oregon. In honor of Meghan's relationship with Prince Harry, he created a strain of the drug called Markle's Sparkle. He's been outspoken about the wedding, but less critical than the rest of his family. He reportedly last spoke to Meghan three years ago and is not invited to the wedding.

Trevor Engelson, Meghan's ex-husband: Trevor is a film producer and manager in Hollywood residing in Los Angeles. He started dating Meghan in 2004 before getting engaged in 2010, married in 2011 and divorced in 2013, citing "irreconcilable differences." He was reportedly developing a television series about a woman who leaves a man for a prince, before recently halting the project.

More from AOL.com:
Meghan Markle and Prince Harry’s song choice for first dance will shock you
Duchess Fergie 'deeply unhappy' over royal wedding reception snub: Report
14 books about the lives of the British royal family