When the twins were six years old George broke his leg after a prank gone wrong - the brake was too bad to be fixed by magic so George had to heal the muggle way.
After trying to brake his leg to be matching (and getting shouted at by Mrs Weasley for almost an hour) Fred stopped trying to brake his leg and vowed to help his twin in anyway he could.
At first this meant getting them snacks or running up 3 flights of stairs to get George his forgotten jumper, but after three days with his crutches, George had given up so Fred offered to piggy back him around.
Although it was normal to see the twins together it soon became a common sight that whenever standing George would be on Fred's back.
This helped Mrs Weasley identify them... But only for a few months.
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Harry Potter Headcannons!
FanfictionBasically what the title says, maybe with the occasional oneshot