When they first found out that Miss Tongue was expecting twins, doctors said there was a one-in-a-million chance that the babies, created by two separate eggs, would have a different skin tone.
And when they were born in October 2011 at West Middlesex University Hospital in Isleworth, West London, they virtually looked identical.
But four years on, the boys couldn't be different as Bobby has blue eyes and a light complexion while Riley's skin and hair is dark like his father's.![]()
The twins, from Feltham, West London, were born to mother Abigail Tongue, 22, who is white and father Richard George, 26, who is of mixed race.
Their personalities also developed differently with Bobby becoming very independent and active and Riley more laid-back and clingy.
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And when they were born in October 2011 at West Middlesex University Hospital in Isleworth, West London, they virtually looked identical.
But four years on, the boys couldn't be different as Bobby has blue eyes and a light complexion while Riley's skin and hair is dark like his father's.
The twins, from Feltham, West London, were born to mother Abigail Tongue, 22, who is white and father Richard George, 26, who is of mixed race.
Their personalities also developed differently with Bobby becoming very independent and active and Riley more laid-back and clingy.
Mr George said 'When she was pregnant we'd joke how one could be black like me and another white like Abbie but we never thought it would happen.'But despite their adorable appearance, the boys' mother Miss Tongue says she has had strange looks in the street and people asking if she is just babysitting Riley or if Mr George is actually their father.
Even two years ago when Bobby broke his leg, staff at the West Middlesex Hospital did not believe the boys were twins and checked Miss Tongue's medical records to be sure.
She also told the newspaper: 'I couldn't believe I had two different coloured babies.
She also told the newspaper: 'I couldn't believe I had two different coloured babies.
'It's so uncomfortable and awkward because they are insinuating I've had an affair. It can be quite upsetting, people not believing your child is yours.'The couple also have a 17-month-old daughter called Amelia who's complexion is a combination of both of her parents.
Miss Tongue added: 'We're a special family, our two boys show that. The doctors said they're one in a million - and I agree.'