It's not something that's comfortable to talk about, but there's no denying that we've all thought about what would happen when Queen Elizabeth II passes away.

As of February 6, 2018, Her Majesty has been on the throne for 66 years. She became the head of the British royal family after her father, King George VI passed away in 1952.

While the Queen is still in good health and carrying out her official duties, at 92 years old, she's been rumored to be making preparations to hand over the throne to her successor, her eldest son Prince Charles.

"Out of the profound respect the Queen holds for the institution of monarchy and its stewardship, Her Majesty would want to make sure that she has done everything she can for her country and her people before she hands over," said a former senior member of the Royal Household. "She is dutiful to her core."

It has been speculated that when the monarch turns 95 she will seek legislation, the Regency Act, to grant Charles the power to be King while she's still alive.

"Her Majesty is mindful of her age and wants to make sure when the time comes, the transition of the Crown is seamless," the source added.

Since the Queen has previously vowed to never renounce the throne, Charles, whose current title is His Royal Highness Prince of Wales and the Duke of Cornwall, would be king in all but name. However, the moment she passes away, he will officially become King Charles.

Charles' wife, Camilla, the Duchess of Cornwall, will also earn a new title. She will become Queen Consort, but she may choose to be called Princess Consort.

"At the time of her 2005 wedding to Prince Charles, Clarence House said the Duchess of Cornwall would be known as Princess Consort when her husband became King," said Hello! royal correspondent Emily Nash. "Memories of his divorce and the tragic death of Princess Diana meant the public were not receptive to the idea of her becoming Queen at that time."

Among the several royals taking on new titles when Charles becomes king are William and Kate. The Duke and Duchess of Cambridge's new styles will be unique because they may have two new titles!

According to royal expert Marlene Koenig, William and Kate, both 36, will keep their current titles, but there's a high chance they will inherit Charle's titles. So they would be referred to as HRH The Duke and Duchess of Cornwall and Cambridge.

Koenig also thinks that William could become the next Prince of Wales, which will make Kate the Princess of Wales, a title that the Queen bestowed on Diana.

However, it's important to note that royal titles aren't hereditary so it will be up to the monarch to decide who gets what. For example, Queen Elizabeth didn't give Charles the title of Prince of Wales until he was nine years old.

As for the newly-minted Duke and Duchess of Sussex, Prince Harry and Meghan Markle, they will very likely hold their current titles for life.

After the birth of Prince Louis, Harry was bumped to sixth in line for the throne, so unless something happened (God forbid) to the five that come before him, he won't ever be king.

Unlike his brother's three children, Prince George, Princess Charlotte and Prince Louis, Harry's offspring will likely be known as Lord or Lady Mountbatten-Windsor because they would be the great-grandchildren of the Sovereign, which will happen if Prince Charles becomes king.

The only way they would have Prince or Princess as titles is if Harry and Meghan decide to style their names that way.

Hopefully this clears up any confusion as to why certain members of the royal family have titles, while others, like the Queen's grandaughter Zara Tindall, do not.

Should Kate be called the Princess of Wales when Charles becomes King? Sound off in the comments!