Two little witches

Two little witches were twin sisters who Harry spotted in Quidditch World Cup final in 1994. Girls were flying on little brooms, much like the one that Harry got from Sirius when he was around their age. It is likely that both of their parents are wizard, because wizard from the Ministry went to warn their parents, since there were Muggles as well.

Since the twins show magical abilities, they would start Hogwarts in c. 2002 or 2003.