Britain's Prince George is "fascinated" by his sister, Princess Charlotte.

Princes William and George

Princes William and George

The 21-month-old tot was introduced to his younger sibling earlier this month (02.05.15) after Duchess Catherine gave birth to her at St Mary's Hospital in London and is now feeling "pretty pleased" to have another youngster in the family.

A royal insider revealed to HollywoodLife.com: "They have been continuing to introduce Prince George to Charlotte and he's absolutely fascinated by his sister."

"He smiles and points at her whenever he sees her and seems pretty pleased with her."

"There hasn't been any real doting on her yet from George, as he's still obviously getting used to her. But, in time, he will of course think the world of her. Or at least that's what one would hope for."

The news comes after the duchess and Prince William took their two children back to their country retreat, Anmer Hall on the Queen's Sandringham Estate, where they are expected to live for the foreseeable future.

However, the parents won't be alone to care for their two children, as Catherine's mother, Carole Middleton, is staying with them for a few weeks until they readjust.

A source said: "She will be there for the first month to help out.

"Kate feels like she owes so much to her mom for helping out during George's birth. Nothing feels better than having your mum around during a time like this."