Speaking to the Mail on Sunday, the source added: "They don't really get on". It's "all but confirmed", the report adds.
Middleton is mom to Prince George, Prince Charlotte and Prince Louis, so Markle and Harry's little one will already have plenty of playmates to grow up with. They were originally rumored to be moving into Kensington's Apartment 1, right next to William and Kate.
Another source suggested that the fight has arisen in part from the way Harry perceived his brother's treatment of his new wife: "Harry felt William wasn't rolling out the red carpet for Meghan and told him so".
After the arrival of Meghan Markle, outed as Harry's girlfriend in November 2016, press fever surrounding the inner workings of the family and possible tensions between the two women has only continued to grow. "No big fallout but Kate and Meghan not close".
In 2017 Kate revealed that George could count up to ten in Spanish, having been taught by his Spanish nanny Maria Teresa Turin Borrallo. "Why would she want to leave such a prestigious job so soon?"
NASA's InSight lander successfully reaches Mars
Settling In InSight's first few days on the Red Planet won't be as eventful as the probe's nerve-wracking descent and landing. The probe landed safely on a flat plain known as Elysium Planitia, close to the Red Planet's equator.
However, others have hinted that there may have been tensions between the two Duchesses ahead of the royal wedding in May.
A Kensington Palace spokesman had declined to comment when the story first broke earlier this month but a Palace source did pay tribute to Melissa in a highly unusual move.
Meghan Markle and Prince Harry's fairytale wedding may have gone off without a hitch, but there was apparently major drama going on behind the scenes.
Meghan initially wanted a tiara that featured emeralds, according to royal sources.
"Absolutely!" she exclaims when asked if she is excited about the Duchess of Sussex's pregnancy in a fan video captured on Instagram.