Franklin Augustus Longbottom II, born in 2006 to Neville Longbottom and Hannah Longbottom (née Abbott). Younger brother of Alice Victoria, older brother of Julia Grace.
 
(Kevin Flamme)

Dominique Gabrielle Weasley, born 2002 to William "Bill" Weasley and Fleur Weasley (née Delacour). Younger sister of Victoire Apolline, older sister of Louis William.
 
(Freya Mavor)

Delphine Elysia Bennett, born 2009 to Laurence Bennett and Gabrielle Bennett (née Delacour). Younger sister of Alastair Alexandre and Nathalie Océane.
 
(Kirsten Prout)

Cassiopeia Lesath Malfoy, born 2007 to Draco Malfoy and Luna Malfoy (née Lovegood). Younger sister of Scorpius Hyperion, twin sister of Aries Orion.
 
(Ginny Gardner)

Aries Orion Malfoy, born 2007 to Draco Malfoy and Luna Malfoy (née Lovegood). Younger brother of Scorpius Hyperion, twin brother of Cassiopeia Lesath.
 
(Niall Horan)

Alistair Alexandre Bennett, born 2004 to Laurence Bennett and Gabrielle Bennett (née Delacour). Older brother of Nathalie Océane and Delphine Elysia.
 
(Harry Judd)

Alice Victoria Longbottom II, born 2002 to Neville Longbottom and Hannah Longbottom (née Abbott). Older sister of Franklin Augustus and Julia Grace.
 
(Anna Popplewell)

Albus Severus Potter, born 2006 to Harry James Potter and Ginevra Molly Potter (née Weasley). Younger brother of James Sirius, older brother of Lily Luna.
 
(Logan Lerman)