But the Internet has just discovered that the royal brothers have secret step-siblings and they can't seem to believe it.
The duo are Camilla Parker-Bowles' (the wife of Prince Charles) children. There's Tom, who is a well-respected food critic, and Laura, who is lesser known by the public.
Laura Lopes has kept firmly out of the spotlight since her mother married into the royal family but you may well recognise her from the royal wedding, where she acted as one of Kate Middleton's bridesmaids.
Laura's married to an accountant and the pair have three children, 10-year-old Eliza, and twin boys, Louis and Gus, who are nine.
Laura will no doubt make an appearance at Prince Harry and Meghan Markle's wedding this Spring.
The duo has been busy planning for their upcoming nuptials at St George’s Chapel at Windsor Castle on May 19 2018.
We will keep our eyes firmly peeled for a glimpse of Tom and Laura in May.
The Royal Family Photo Album
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