Two of them arrived on identical bicycles, sporting identical helmets and matching rucksacks.
Another pair stayed so close they barely strayed apart by more than a couple of paces.
And some of them have had a spooky idea about what the other was about to say, before she even said it.
Today, some of these intriguing links were finally explored at a record-breaking gathering of twins taking part in the world’s biggest medical study.
Runs in the family: Twins Helen Watson, left, and Janet Barron, right, with Janet’s twins Maisy, left, and Isla, right, at St. Thomas’ Hospital to celebrate the genetic research of twins over the last 21 years
Paired up: Seven sets of twins from London who have taken part in the Kings College twins research programme which is celebrating it 21st anniversary this weekend
Record breaking: Hundreds of pairs of twins gather in the grounds of St. Thomas’ Hospital in London to celebrate genetic research of twins today
Mirror image: Twins relax in the grounds of St. Thomas’ Hospital where important research has been carried out into the genetics of twins
Twins Carole Dempster, left, and Jayne Brocklehurst, right, pictured at the 21st anniversary event
All in attendance: From left to right are twins Janet and Janese, Hazel and Christine, Margaret and Barbara, Rebecca and Zoe, Gemma and Nadine at the celebratory event
Around 750 individuals (that’s 375 pairs in anyone else’s language) assembled to celebrate 21 years of research by the Department of Twin Research at King’s College, London, based at St Thomas’ Hospital.
More than 12,000 twins aged between 16 and 101 are registered for the study, which has helped experts to catalogue a series of findings that range from the mildly fascinating, such as twins drink an average 24 cups of tea a week and like Marmite, to potentially ground-breaking discoveries.
They include scientists discovering more than 400 novel genes associated with over 30 diseases since the study began in 1992, enabling researchers to investigate genetic and environmental causes of traits and illnesses including cancer, short-sightedness, osteoporosis, pain, diabetes and obesity.
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