If you search it up, according to this website, Rose Weasley and Scorpius Malfoy end up together. I searched it and that’s what I found out.

That's not actually true, though - canonically speaking, Hermione ended up with Ron, and Rose doesn't really have a love interest unless you count Cursed Child as canon

And even then, them dating doesn't guarantee that they'll end up together

But... SCORBUS tho!

Scorpius will marry Albus Severus

I've always thought of Scorpius marrying Lily, who is half-blood, but if they have children they would be pureblood since according to J.K. Rowling, great-grandparents don't count. As long as there are no muggle or Muggle-borns grandparents, they could be pureblood. What do you think?

If it goes that way, no matter who Scorpius marries whether it is Rose or Lily or Lucy or anyone else, his eldest son marries a Scottish witch named Alana Macmillan, the Scottish granddaughter of Ernie, and his eldest daughter marries Dirk Montague, the grandson of Graham. 

Remember when Graham got lost in a cabinet?

When you do fanfiction on family trees expanding including the Weasleys, please include the families of those on Marcus Flint’s team, including the Flints, the Bletchleys, the Boles, the Derricks, the Warringtons, the Puceys, the Montagues, and the Higgses, and also the Davieses, the Goyles, the Cresswells, the Vanes, the Gamps, and possibly try Dippet’s family, a family with the surname Proudmore or Quinn or Merrythought, and possibly try other families included on the Sacred 28, including the Shafiqs and the Fawleys, and possibly others.