"I guarantee that 99% of you if you could meet my dad he would love him and want to give them a big hug he is a sweetheart and might be a little bit shy but he has a huge heart so it is very wrong to misinterpret him", she wrote.
The length of her stay in the United Kingdom is unknown, but it is thought that she intends to confront Meghan, 36, over their father's ill-health.
After the 74-year-old was exposed, he reportedly had a heart attack and did not attend his daughter's wedding.
Given her background as an actress, PR and brand consultant Nick Ede feels that public speaking is where Meghan's strengths lie.
Sources have revealed to the Daily Mail, however, that Meghan would never entertain the idea of a showdown with her half sister.
"I used to have a phone number and text number for her personal aides at the Palace, but after I said a few critical words about the Royal Family changing Meghan, they cut me off".
Regresa Carmen Aristegui a la radio
Después del escándalo por el abrupto despido de Carmen Aristegui de parte de MVS Noticias en marzo del 2015, la conductora volverá a tener un programa.
Earlier this month, Samantha went on a furious social media tirade about her sister and her new husband.
The insider says, "Meghan is sick of Samantha's manipulation and games, and she's has made it crystal clear that she doesn't want to see or speak to Samantha, for even one minute, and who can blame her quite frankly?" "As you 'Mack down" on your birthday cake, think about the birthday wishes you never extended to your FATHER-IN-LAW'. "The duchA** can bow to the daddy".
She wrote: '[He] thinks he can shoot someone and still get votes.
It is believed she has not been contact with him either since her marriage after Mr Markle was caught selling photographs of himself to the paparazzi.
She said: 'Samantha has always tried to drive a wedge between Meghan and her father, and this is no exception.
'And as far as her dad's health is concerned, Meghan is not anxious.