Queen Elizabeth II’s favorite member of the royal family is reportedly Sophie, Countess of Wessex.

An unnamed source recently said that there’s one obvious indication why this may be the case. Her Majesty is reportedly pleased with the fact that it is only Sophie and Prince Edward’s marriage among her four children that have survived.

The Earl and Countess of Wessex tied the knot in 1999 and they have not separated since then. But Prince Edward’s older siblings’ first marriages have all failed.

Princess Anne was the first of the Queen and Prince Philip’s children to have gotten a divorce from Captain Mark Phillips. Prince Charles followed years later after her divorced Princess Diana in 1996. In the same year, Prince Andrew and Sarah Ferguson’s divorce was also finalized.

According to the source, the Queen is also well aware of the fact that Prince Edward is not an easy person to be with so she is pleased with the fact that Sophie has stayed with him through it all.

“The Queen is also mindful that Sophie’s marriage has survived where her other children’s relationships have failed – and she knows that is in no small way down to Sophie’s dedication – she is aware, as his Edward’s mother, what a tricky creature he can be. And not only has Sophie flourished as a dedicated, albeit still a relatively junior member of the Royal family, she has brought up two teenagers who are well-balanced, sporty, amusing and delightful,” the source said.

Meanwhile, there is also another indication that proves Sophie is the Queen’s favorite member of the royal family. On Sundays, the monarch reportedly asks the mom of two if she wants to ride with her to church.

“If Sophie Wessex is staying at Sandringham then you can pretty much guarantee the Queen will ask her – usually the last thing on a Saturday night – if she would like ‘a lift’ to the church,” a royal equerry told The Sun.

Is Queen Elizabeth’s Favorite Royal Really Sophie? This Key Factor Proves Claim Sophie, Countess of Wessex (L), laughs as she sits with Queen Elizabeth during the centenary annual meeting of The national Federation Of Women’s Institute, at the Royal Albert Hall in London, Britain, June 4, 2015. photo: REUTERS/Chris Jackson/pool