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What do two royal weddings and two royal babies mean for the line to the British throne?

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How will two weddings and two royal babies affect the line to the throne? (Frank Augstein, pool/AP Photo|Matt Dunham/AP Photo)

Princess Eugenie on Monday announced that she will marry Jack Brooksbank in the fall. It's just the latest exciting news for fans of the royal family: In 2018, the extended family will have two weddings and is expecting two new babies.

So how does this affect the line of succession to the British throne? Here's everything you need to know.

WHO IS NEXT IN LINE?


Here are the first 10:
1. Charles, Prince of Wales - The queen's firstborn
2. William, Duke of Cambridge - Prince Charles' firstborn and the queen's grandchild
3. Prince George of Cambridge - Prince William's firstborn and the queen's great-grandchild
4. Princess Charlotte of Cambridge - Prince William's second child and the queen's great-grandchild
5. Prince Henry (Harry) of Wales - Prince Charles' second child and the queen's grandchild
6. Andrew, Duke of York - the queen's third child and second eldest son
7. Princess Beatrice of York - Prince Andrew's firstborn
8. Princess Eugenie of York - Prince Andrew's second child

9. Edward, Earl of Wessex - the queen's youngest child and third eldest son
10. James, Viscount Severn - Prince Edward's second child and eldest son, also the queen's youngest grandchild

HOW IS THE LINE DECIDED?


The line of succession is determined by descent and also by Parliamentary statute, according to the royal family's website. This was decided by the Act of Settlement of 1701, which states that those in line to the throne must be protestant descendants of Princess Sophia. It was decided in the 2013 Succession to the Crown Act that those who marry Roman Catholics are no longer disqualified from the line.

The eldest son of the queen, followed by all his descendants, are in line for the throne ahead of all others. They are followed by her second eldest son and all his descendants, and so on.

HOW DOES GENDER PLAY A ROLE?


Though Anne, The Princess Royal, is Queen Elizabeth II's second eldest child, she is 12th in line to the throne, behind her brothers and all their descendants. This is because the Act of Settlement of 1701 included a system of male primogeniture, which meant that younger brothers would jump in front of their older sisters in line.

This rule does not apply to the newest generation, however, thanks to the 2013 Succession to the Crown Act. It states that, for any royals born after Oct. 28, 2011, the succession will be decided by birth order, regardless of gender. Since Charlotte was born after this date, she will stay fourth in line even if younger brothers are born after her.

WHAT EFFECT WILL THE ROYAL WEDDINGS HAVE?


As you probably noticed, Kate, Duchess of Cambridge is not in line for the throne, even though her husband Prince William is second in line. Royal weddings do not immediately affect the line of succession because spouses are not descendants of Princess Sophia.

This means that neither Meghan Markle (who is marrying Prince Harry in May) nor Jack Brooksbank (who is marrying Princess Eugenie in August) will be in the line. But what does that mean for any future children?

Meghan and Harry: Any children will be right after Harry in the line, in the order of their births. They will all be ahead of Prince Andrew.

Eugenie and Jack: Any children will be right after Eugenie in line, in the order of their births. They will be ahead of Prince Edward.

WHAT EFFECT WILL THE ROYAL BIRTHS HAVE?


There are more imminent shifts ahead than any potential children from this year's royal weddings. Both Kate and Zara Tindall, who is 16th in line to the throne, are expecting children. Both of these children will have a place in line.

William and Kate's child: The baby will be in line behind Prince George and Princess Charlotte, making him or her fifth. This will bump everyone down one spot, making Prince Harry sixth.

Zara Tindall's child: Zara, a grandchild of Queen Elizabeth II, is the second child of Princess Anne. Zara and her husband have one child, Mia Grace, who is 17th in line behind her mom. After Kate's youngest bumps everyone down the line, Zara's youngest will be 19th.

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