Too many turns!
When the their generation turn too many times, this happens.
(Names of the children as on the collage from top right Fred Weasley II, Rose Weasley, Victore Weasley. Bellow is Roxanne Weasley. Then from the. right again, Lily Luna Potter and then James Sirius Potter. Then Albus Severus And then Amelia Longbottom (Luna and Neville) Lucinda Longbottom, Teddy Lupin, Scorpius Malfoy and then Hugo. All characters except Amelia and Lucinda Longbottom Belong to J.K Rowling.