It is believed Meghan is not even "speaking" to her father, who divorced Meghan's mother Doria Ragland in 1988 when Meghan was just six.
Both she and actor Patrick J Adams will be walking away from the show after the episode airs.
Anticipation is at an all-time high for Meghan marry Prince Harry in real life next month, so seeing the trailer has come at the ideal time.
"You are the husband I've always wanted", she tells him.
He told the Mirror: "I've read that Meg wants to be like Diana. She's not genuine like Diana".
Souvenir mugs to commemorate the wedding of Britain's Prince Harry and Meghan Markle are stacked at the Emma Bridgewater Factory, in Hanley, Stoke-on-Trent, Britain March 28, 2018.
Earlier this week, her fiancé was named as the new Commonwealth Youth Ambassador, and so Markle attended the reception to support the initiative, wearing a dress by Altuzarra.
On the other hand, Thomas Jr., the half-brother of Meghan Markle slammed her for not inviting them to her wedding day.
A palace insider has cast doubt on whether or not Thomas Markle Sr will attend the wedding, after revealing a shocking rift between father and daughter.
"Some people have fallen out with her, some people adore her", said Morton, who has also penned biographies of actor Tom Cruise, singer Madonna and Monica Lewinsky, The White House intern whose affair with Bill Clinton nearly toppled the USA president.
"I would love to see Meghan in something that goes directly against tradition", says Young.