He believes that Megan has become futile. He also said that it spoils relations with his family.
"The less time left for your royal wedding, it becomes clear that this is the biggest mistake in the history of royal marriages," wrote 51-year-old Thomas.
Not all is well in Megan's relationship with family relationships. Brother Megan says that he has not seen his sister since 2011. According to Thomas, the actress did not invite the family to a wedding and instead called "completely strangers".
"It's quite obvious that her little Hollywood glory has dizzied her head, turning into an overpowered, superficial, vain woman who will deceive you and royal family heritage," Brother Megan believes.
Though Thomas wrote a letter to Prince Harry, he does not deny that Megan remains for him a sister.
Recall that Prince Harry and his bride Megan Markle asked the guests not to bring gifts for their wedding, and to transfer money to charity.
All on the topic Megan MarkPrince Harry.