Prince George, 4, is Harry's nephew and the son of the Duke and Duchess of Cambridge. George is third in line for the throne, behind his grandfather, Prince Charles, and father, Prince William. 

Princess Charlotte is Harry's niece and the daughter of William and Catherine, the Duke and Duchess of Cambridge. Although she is only 3, Charlotte has already served as a bridesmaid -- she was one in her aunt Pippa Middleton's wedding in 2017. 

Florence van Cutsem, 3, is Harry's goddaugther. She daughter of Nicholas and Alice van Custem, whose family are close friends with the royal family. She's also the cousin of Grace van Cutsem, who famously put her hands over her ears during the Duke and Duchess of Cambridge's kiss on the balcony after their wedding.

Remi Litt, 6, and Rylan, 7, are Markle's goddaughters. They are the daughters of Benita, pictured, and Darren Litt. Markle posted a photo on her now-deleted Instagram in front of Christmas decorations with the family. 

Ivy Mulroney, 4, is pictured here waving and accompanied by her mother, Jessica Mulroney, in a blue dress. Ivy's father is  Ben Mulroney, the son of former Canadian Prime Minister Brian Mulroney. Jessica and Meghan became close when Meghan moved to Toronto to work on "Suits," and Jessica picked out Meghan's on-screen wedding dress on her last episode of "Suits," Metro U.K. reports. 

Zalie Warren, 2, is Harry's goddaughter and the daughter of Zoe and Jake Warren. Jake Warren is the son of the Queen's racing manager John Warren, and Harry and Jake attended Eton together. Zalie was the youngest member of the wedding party. 

Jasper Dyer, 6, is Harry's godson and the son of Amanda and Mark Dyer. Mark Dyer is a Welsh Guards officer and Prince Charles's royal equerry, according to Metro U.K.

Twins John and Brian Mulroney, 7, are the sons of Jessica and Ben Mulroney. With no maid of honor, John and Brian carried Meghan's train into the church.