5.

One day, Lily played tea party with her brother and one of her precious china cups slipped out of Al's hand and shattered into pieces on the ground. The little girl started to cry and the boy looked horrified. Then, he began to pick up the pieces.

The moment Harry decided to clean up the mess, he saw how the broken fragments put themselves together and his son was holding a fully repaired cup.

Afterwards the joy was immense because up until this day seven-year-old Albus hadn't shown any signs of magic whatsoever. Or so they had thought at least.