King Charles III reportedly felt unwanted as the royal family grew. Allegedly, the late Queen Elizabeth was fonder of her two youngest sons, Prince Andrew and Prince Edward.

In fact, even Princess Anne was said to be the least of the most favorites. It may be why Prince Andrew is often named Queen Elizabeth's favorite son.

Royal author Christopher Andersen wrote in his new biography about the new king that His Majesty and Princess Royal were treated "very differently" than their younger brothers.

For starters, King Charles is the eldest and is about to turn 74 later this month. Princess Anne, alternatively, is 72. Prince Andrew came next, born in 1960, followed by Prince Edward in 1964.

Andersen revealed that Queen Elizabeth's relationship with her two eldest children differed from her bond with her youngest sons. The book's extract, via Express, noted that Camilla, Queen Consort's husband was "isolated" as a young boy, and it was even heightened when his siblings were born.

An alleged cousin of Her Majesty claimed King Charles even felt unwanted back then. She was allegedly more affectionate toward Prince Andrew, especially her youngest son, Prince Edward.

However, the cousin explained that Queen Elizabeth might be more comfortable in her role as the monarchy leader at the time than when she was only starting. A Buckingham Palace source added it was like a "switch had gone off," and she was suddenly a caring and loving mother.

Sadly, it was too late for King Charles and Princess Anne to experience that. Meanwhile, Queen Elizabeth reportedly turned to her "favorite son," the Duke of York, during her final moments.

For starters, she died on September 8 at Balmoral Castle in Scotland. She was 96 and the longest-serving monarch.

She was in incredibly good health when she reached her 90s, but everything seemed to change when Prince Philip died in 2021. She was later seen using a cane and even told guests at a reception that she couldn't move.

However, the palace remained tight-lipped about her real condition, and the only thing the public knew was that she was experiencing "episodic mobility issues." She then made rarer public appearances, but she was said to be frequently visited by Prince Andrew, which she truly enjoyed.

Vanity Fair's royal correspondent Katie Nicholl told Fox News Digital, via Yahoo!, that Queen Elizabeth regularly saw Prince Andrew until her death. "They remained incredibly close, and she was very protective of him," she said.