There is nothing quite like the bond that exists between sisters, whether they are going through a good or bad moment. And this was never more apparent than when the Princess of Wales, together with her sister Pippa Middleton, attended the most recent men's singles final of Wimbledon. Also present was Princess Kate’s daughter, Princess Charlotte.

In the midst of Princess Kate's long struggle with her health, Pippa made a public appearance that was, without a question, exhausting. She was the epitome of a supporting sister. Additionally, according to an unnamed source who spoke with New Idea Magazine, the future queen has been relying on her sibling more than she ever has before.

“Pippa’s been a complete rock star for Kate. From holding her hand through chemo to keeping the kids busy over the summer break, Kate couldn’t have got through this without her help,” an anonymous insider told the entertainment news outlet.

A prior royal sisterhood, which occurred between the late Queen Elizabeth II and Princess Margaret, is practically identical to the tie that they share among themselves. Reinaldo Herrera, a former friend of the late royals, stated that the sisters were so close to one another that they had a direct phone line to communication with one another and would contact each other every night to "gossip and laugh."

“Even King Charles has remarked on Pippa’s loyalty to Kate and how it’s not unlike his mother’s close relationship with Princess Margaret, who sacrificed her own personal happiness for the Queen and Crown. Pippa has the same willingness to drop everything for Kate. She worships her big sister and would do anything for her,” the informant added.

In February, Princess Kate, who is now 42 years old, was advised that she was suffering from an unidentified form of cancer. Since then, she has been getting preventative chemotherapy. The Princess of Wales is aware that she is fortunate to have her sister by her side at this difficult period for the Middleton family as well as for the remainder of the royal family.

From the time they were in their twenties and living in the same flat in Chelsea until the time they were going through the process of becoming mothers together, Princess Kate and Pippa, who is now 40 years old, have always been extraordinarily close, The Sun reported.

Pippa even resides in Berkshire, with her own three children, Arthur, Grace, and Rose, as well as her husband, James Matthews. She is located just a stone's throw away from Princess Kate from where she lives.

The source of the information added that Buckingham Palace is happy that Princess Kate is following in the footsteps of her late grandmother-in-law by establishing her own strong sisterly connection. This is a continuation of the tradition that her grandmother-in-law had established. The reason for this is that Princess Kate already resembles her grandmother-in-law in a variety of other characteristics.

“The Palace sees Pippa as a valuable asset in the health and wellbeing of its future Queen. Pippa’s never sold out or embarrassed her sister and has been the perfect lady in waiting,” the tattler claimed.