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Planning a wedding is tricky, and it’s even trickier when the British royal family is involved.

While the world watched Kate Middleton marry Prince William in 2011, people also took note of Pippa Middleton, Kate’s sister, who proudly served as her maid of honor. Now that Pippa is about to marry her fiancé, James Matthews, anyone would assume that her sister, Kate, would step in as head bridesmaid to see her sister off.

But this might not be the case.

Traditionally, the distinction of being named “maid of honor” is reserved for unmarried women who know the bride. Since Kate has been married for almost six years and has children, if she were to be part of the wedding party, her role would be “matron of honor.”

According to People, however, Kate may not appear as part of the wedding party at all.

Judy Wade, royals author, told the magazine, “It’s a tricky situation for Pippa. She would want her sister by her side, as who else would she trust to make things go well? But if your sister is a future Queen, she is going to upstage the bride and draw attention. Kate would want to be in the background as much as possible.”

Kate’s children, Prince George and Princess Charlotte, are expected to appear in the wedding party as page boy and flower girl.

Of course, Kate wouldn’t miss the wedding itself. She’ll probably be right up front with an elegant handkerchief in-hand, ready to dab away her happy tears.