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Harry Beware!

Meghan Markle’s Sister Is Writing A Tell-All That Could Ruin Her Royal Wedding Dreams

‘Some of it she won’t like, some of it she might,’ warns Samantha Grant.

Meghan Markle‘s outspoken sister is writing a tell-all — will it include her own skeletons?

No one would have been surprised if Meghan — a divorced, biracial American actress — caught heat from the British public over her relationship with Prince Harry. Shockingly, the detractor drawing the most blood shares Meghan’s bloodline: It’s her own sister!

Eyebrows were raised in November when Samantha Grant, 52 — a Florida resident who suffers from multiple sclerosis and whose father, Thomas Markle Sr., is also Meghan’s — suddenly went public with criticism about her half sister, reportedly calling her “a shallow social climber” and claiming Harry’s clan “would be appalled by what she’s done to her own family.”

Now Samantha (who admittedly hasn’t seen or spoken to Meghan for years) has upped the ante. She recently launched a bizarre Twitter rant questioning the Suits star’s charitable endeavors — and has announced that she’s writing a tell-all book about her famous sibling, adding: “Some of it she won’t like, some of it she might.”

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Though Meghan, 35, has admirably held her tongue, a source told Star, “This looks purely like a money grab by someone coming out of the blue and trying to profit off a famous relative.”

But as Star has exclusively learned, Samantha (who’s had multiple marriages and is the mom of three grown children) might want to remember the old adage about throwing stones in glass houses.

According to New Mexico court documents and records obtained by Star, Samantha (then living in Albuquerque and known by her birth name of Yvonne) was arrested for DWI in 1991. She was eventually found guilty — and the court later cited her for failing to both pay her fines and register for DWI school.

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She was also issued a criminal summons in December 2011 for “use of a telephone to terrify or threaten” after allegedly harassing her second ex-husband, Scott Rasmussen (they had divorced in 2003), while they argued over visitation for their daughter.

Scott recently came forward to defend Meghan against Samantha’s attacks, saying they “are not close at all” — claiming his ex has “a bad attitude.”

Added the source: “Samantha clearly has her own skeletons. If she wants them to stay in the closet, she should refrain from calling out other people!”